diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index a9fcc25..e1cd35a 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -114,6 +114,15 @@
 -----------------------------------------------------------------------
 
 Breaking Changes:
+- Added an extra 'void* renderer_user_data' parameter to ImDrawCallback (stored in ImDrawCmd::UserCallback).
+  This allows custom rendering back-ends to pass custom local rendering information to the callback.
+  IF YOU USE AN OLD RENDERER BACK-END OR COPIED A RENDERER BACK-END BEFORE 1.71,
+  YOUR COMPILATION WILL FAIL ON THIS LINE:
+      pcmd->UserCallback(cmd_list, pcmd);
+  You can fix it by adding a trailing NULL parameter:
+      pcmd->UserCallback(cmd_list, pcmd, NULL);
+  If your back-end needs to support multiple versions, you can use a '#if (IMGUI_VERSION_NUM >= 17004)' test.
+  If you are using an old copied back-end, consider building the one directly in the imgui repository.
 - IO: changed AddInputCharacter(unsigned short c) signature to AddInputCharacter(unsigned int c).
 - Renamed SetNextTreeNodeOpen() to SetNextItemOpen(). Kept inline redirection function (will obsolete).
 - Window: rendering of child windows outer decorations (e.g. bg color, border, scrollbars) is now
diff --git a/examples/imgui_impl_allegro5.cpp b/examples/imgui_impl_allegro5.cpp
index 525ad5c..9ef48e6 100644
--- a/examples/imgui_impl_allegro5.cpp
+++ b/examples/imgui_impl_allegro5.cpp
@@ -15,6 +15,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-XX-XX: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
 //  2019-05-11: Inputs: Don't filter character value from ALLEGRO_EVENT_KEY_CHAR before calling AddInputCharacter().
 //  2019-04-30: Renderer: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
@@ -150,7 +151,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplAllegro5_SetupRenderState(draw_data);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_dx10.cpp b/examples/imgui_impl_dx10.cpp
index 6dec614..05f4bfb 100644
--- a/examples/imgui_impl_dx10.cpp
+++ b/examples/imgui_impl_dx10.cpp
@@ -11,6 +11,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-XX-XX: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-07-21: DirectX10: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData().
 //  2019-05-29: DirectX10: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX10: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
@@ -231,7 +232,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplDX10_SetupRenderState(draw_data, ctx);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_dx11.cpp b/examples/imgui_impl_dx11.cpp
index 89b88de..fd48f21 100644
--- a/examples/imgui_impl_dx11.cpp
+++ b/examples/imgui_impl_dx11.cpp
@@ -11,6 +11,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-XX-XX: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-07-21: DirectX11: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData. Clearing Hull/Domain/Compute shaders without backup/restore.
 //  2019-05-29: DirectX11: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX11: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
@@ -240,7 +241,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplDX11_SetupRenderState(draw_data, ctx);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_dx12.cpp b/examples/imgui_impl_dx12.cpp
index b40e928..acc6563 100644
--- a/examples/imgui_impl_dx12.cpp
+++ b/examples/imgui_impl_dx12.cpp
@@ -13,6 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-06-05: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-05-29: DirectX12: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX12: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-03-29: Misc: Various minor tidying up.
@@ -219,7 +220,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplDX12_SetupRenderState(draw_data, ctx, fr);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_dx9.cpp b/examples/imgui_impl_dx9.cpp
index 2ee76ca..a85a505 100644
--- a/examples/imgui_impl_dx9.cpp
+++ b/examples/imgui_impl_dx9.cpp
@@ -11,6 +11,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-06-05: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-05-29: DirectX9: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: DirectX9: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-03-29: Misc: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects().
@@ -191,7 +192,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplDX9_SetupRenderState(draw_data);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_marmalade.cpp b/examples/imgui_impl_marmalade.cpp
index 497a570..86160cb 100644
--- a/examples/imgui_impl_marmalade.cpp
+++ b/examples/imgui_impl_marmalade.cpp
@@ -12,6 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-XX-XX: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
 //  2019-05-11: Inputs: Don't filter value from character callback before calling AddInputCharacter().
 //  2018-11-30: Misc: Setting up io.BackendPlatformName/io.BackendRendererName so they can be displayed in the About Window.
@@ -76,7 +77,7 @@
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
             if (pcmd->UserCallback)
             {
-                pcmd->UserCallback(cmd_list, pcmd);
+                pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_metal.mm b/examples/imgui_impl_metal.mm
index f3f1b12..b37991b 100644
--- a/examples/imgui_impl_metal.mm
+++ b/examples/imgui_impl_metal.mm
@@ -11,6 +11,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-06-05: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-05-29: Metal: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: Metal: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-02-11: Metal: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
@@ -495,7 +496,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     [self setupRenderState:drawData commandBuffer:commandBuffer commandEncoder:commandEncoder renderPipelineState:renderPipelineState vertexBuffer:vertexBuffer vertexBufferOffset:vertexBufferOffset];
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_opengl2.cpp b/examples/imgui_impl_opengl2.cpp
index 95720ff..45cf93c 100644
--- a/examples/imgui_impl_opengl2.cpp
+++ b/examples/imgui_impl_opengl2.cpp
@@ -18,6 +18,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-06-05: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-02-11: OpenGL: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
 //  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
@@ -155,7 +156,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplOpenGL2_SetupRenderState(draw_data, fb_width, fb_height);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_opengl3.cpp b/examples/imgui_impl_opengl3.cpp
index 9585215..dc3fb64 100644
--- a/examples/imgui_impl_opengl3.cpp
+++ b/examples/imgui_impl_opengl3.cpp
@@ -13,6 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-06-05: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-05-29: OpenGL: Desktop GL only: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-03-29: OpenGL: Not calling glBindBuffer more than necessary in the render loop.
@@ -295,7 +296,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/examples/imgui_impl_vulkan.cpp b/examples/imgui_impl_vulkan.cpp
index b55cb19..8e09103 100644
--- a/examples/imgui_impl_vulkan.cpp
+++ b/examples/imgui_impl_vulkan.cpp
@@ -22,6 +22,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2019-06-05: Misc: Added extra NULL parameter to the pcmd->UserCallback() call to fix compilation with the new ImDrawCallback api.
 //  2019-05-29: Vulkan: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
 //  2019-04-30: Vulkan: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
 //  2019-04-04: *BREAKING CHANGE*: Vulkan: Added ImageCount/MinImageCount fields in ImGui_ImplVulkan_InitInfo, required for initialization (was previously a hard #define IMGUI_VK_QUEUED_FRAMES 2). Added ImGui_ImplVulkan_SetMinImageCount().
@@ -394,7 +395,7 @@
                 if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                     ImGui_ImplVulkan_SetupRenderState(draw_data, command_buffer, rb, fb_width, fb_height);
                 else
-                    pcmd->UserCallback(cmd_list, pcmd);
+                    pcmd->UserCallback(cmd_list, pcmd, NULL);
             }
             else
             {
diff --git a/imgui.cpp b/imgui.cpp
index ce9e1c1..84075f5 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -288,7 +288,7 @@
              const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
              if (pcmd->UserCallback)
              {
-                 pcmd->UserCallback(cmd_list, pcmd);
+                 pcmd->UserCallback(cmd_list, pcmd, NULL);
              }
              else
              {
@@ -368,6 +368,15 @@
  When you are not sure about a old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all imgui files.
  You can read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2019/XX/XX (1.XX) - added an extra 'void* renderer_user_data' parameter to ImDrawCallback (stored in ImDrawCmd::UserCallback).
+                       this allows custom rendering back-ends to pass custom local rendering information to the callback.
+                       if you use an renderer back-end based on or copied from one before version 1.71, compilation will fail on this line:
+                           pcmd->UserCallback(cmd_list, pcmd);
+                       you can fix it by adding a trailing NULL parameter:
+                           pcmd->UserCallback(cmd_list, pcmd, NULL);
+                       if your back-end needs to support multiple versions, you can use a '#if (IMGUI_VERSION_NUM >= 17004)' test.
+                       if you are using an old copied back-end, consider building the one directly in the imgui repository.
+
  - 2019/07/15 (1.72) - removed TreeAdvanceToLabelPos() which is rarely used and only does SetCursorPosX(GetCursorPosX() + GetTreeNodeToLabelSpacing()). Kept redirection function (will obsolete).
  - 2019/07/12 (1.72) - renamed ImFontAtlas::CustomRect to ImFontAtlasCustomRect. Kept redirection typedef (will obsolete).
  - 2019/06/14 (1.72) - removed redirecting functions/enums names that were marked obsolete in 1.51 (June 2017): ImGuiCol_Column*, ImGuiSetCond_*, IsItemHoveredRect(), IsPosHoveringAnyWindow(), IsMouseHoveringAnyWindow(), IsMouseHoveringWindow(), IMGUI_ONCE_UPON_A_FRAME. Grep this log for details and new names.
diff --git a/imgui.h b/imgui.h
index 23efa5d..78a280e 100644
--- a/imgui.h
+++ b/imgui.h
@@ -47,7 +47,7 @@
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
 #define IMGUI_VERSION               "1.72"
-#define IMGUI_VERSION_NUM           17200
+#define IMGUI_VERSION_NUM           17200+1
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 
 // Define attributes of all API symbols declarations (e.g. for DLL under Windows)
@@ -1760,10 +1760,11 @@
 // you can poke into the draw list for that! Draw callback may be useful for example to: 
 //  A) Change your GPU render state,
 //  B) render a complex 3D scene inside a UI element without an intermediate texture/render target, etc.
-// The expected behavior from your rendering function is 'if (cmd.UserCallback != NULL) { cmd.UserCallback(parent_list, cmd); } else { RenderTriangles() }'
+// The expected behavior from your rendering function is 'if (cmd.UserCallback != NULL) { cmd.UserCallback(parent_list, cmd, NULL); } else { RenderTriangles() }'
+// Pre-1.71 versions were missing the 'void* renderer_user_data', if you are getting a compile error on an old back-end, add an extra 'NULL' parameter to the call.
 // If you want to override the signature of ImDrawCallback, you can simply use e.g. '#define ImDrawCallback MyDrawCallback' (in imconfig.h) + update rendering back-end accordingly.
 #ifndef ImDrawCallback
-typedef void (*ImDrawCallback)(const ImDrawList* parent_list, const ImDrawCmd* cmd);
+typedef void (*ImDrawCallback)(const ImDrawList* parent_list, const ImDrawCmd* cmd, void* renderer_user_data);
 #endif
 
 // Special Draw callback value to request renderer back-end to reset the graphics/render state.
@@ -1773,7 +1774,7 @@
 #define ImDrawCallback_ResetRenderState     (ImDrawCallback)(-1)
 
 // Typically, 1 command = 1 GPU draw call (unless command is a callback)
-// Pre 1.71 back-ends will typically ignore the VtxOffset/IdxOffset fields. When 'io.BackendFlags & ImGuiBackendFlags_RendererHasVtxOffset'
+// Pre-1.71 back-ends will typically ignore the VtxOffset/IdxOffset fields. When 'io.BackendFlags & ImGuiBackendFlags_RendererHasVtxOffset'
 // is enabled, those fields allow us to render meshes larger than 64K vertices while keeping 16-bits indices.
 struct ImDrawCmd
 {