diff --git a/imgui.cpp b/imgui.cpp
index 7a4b3c6..e57cdba 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -9739,7 +9739,6 @@
     TextUnformatted(label, FindRenderedTextEnd(label));
     EndGroup();
     PopID();
-
     return value_changed;
 }
 
@@ -10098,9 +10097,7 @@
 {
     const bool pressed = RadioButton(label, *v == v_button);
     if (pressed)
-    {
         *v = v_button;
-    }
     return pressed;
 }
 
@@ -10381,7 +10378,7 @@
     const bool is_password = (flags & ImGuiInputTextFlags_Password) != 0;
     const bool is_undoable = (flags & ImGuiInputTextFlags_NoUndoRedo) == 0;
 
-    if (is_multiline) // Open group before calling GetID() because groups tracks id created during their spawn
+    if (is_multiline) // Open group before calling GetID() because groups tracks id created within their scope, 
         BeginGroup();
     const ImGuiID id = window->GetID(label);
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
@@ -11090,7 +11087,6 @@
 
     TextUnformatted(label, FindRenderedTextEnd(label));
     EndGroup();
-
     return value_changed;
 }
 
@@ -11468,6 +11464,7 @@
     return false;
 }
 
+// FIXME: Rename to BeginListBox()
 // Helper to calculate the size of a listbox and display a label on the right.
 // Tip: To have a list filling the entire window width, PushItemWidth(-1) and pass an empty label "##empty"
 bool ImGui::ListBoxHeader(const char* label, const ImVec2& size_arg)
@@ -11495,6 +11492,7 @@
     return true;
 }
 
+// FIXME: Rename to BeginListBox()
 bool ImGui::ListBoxHeader(const char* label, int items_count, int height_in_items)
 {
     // Size default to hold ~7 items. Fractional number of items helps seeing that we can scroll down/up without looking at scrollbar.
@@ -11511,6 +11509,7 @@
     return ListBoxHeader(label, size);
 }
 
+// FIXME: Rename to EndListBox()
 void ImGui::ListBoxFooter()
 {
     ImGuiWindow* parent_window = GetCurrentWindow()->ParentWindow;
@@ -11658,7 +11657,7 @@
         return false;
 
     IM_ASSERT(!window->DC.MenuBarAppending);
-    BeginGroup(); // Save position
+    BeginGroup(); // Backup position on layer 0
     PushID("##menubar");
 
     // We don't clip with current window clipping rectangle as it is already set to the area below. However we clip with window full rect.
@@ -11710,7 +11709,7 @@
     PopID();
     window->DC.MenuBarOffset.x = window->DC.CursorPos.x - window->MenuBarRect().Min.x; // Save horizontal position so next append can reuse it. This is kinda equivalent to a per-layer CursorPos.
     window->DC.GroupStack.back().AdvanceCursor = false;
-    EndGroup();
+    EndGroup(); // Restore position on layer 0
     window->DC.LayoutType = ImGuiLayoutType_Vertical;
     window->DC.NavLayerCurrent--;
     window->DC.NavLayerCurrentMask >>= 1;
@@ -12792,6 +12791,7 @@
 // Lock horizontal starting position + capture group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)
 void ImGui::BeginGroup()
 {
+    ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
 
     window->DC.GroupStack.resize(window->DC.GroupStack.Size + 1);
@@ -12803,21 +12803,20 @@
     group_data.BackupCurrentLineHeight = window->DC.CurrentLineHeight;
     group_data.BackupCurrentLineTextBaseOffset = window->DC.CurrentLineTextBaseOffset;
     group_data.BackupLogLinePosY = window->DC.LogLinePosY;
-    group_data.BackupActiveIdIsAlive = GImGui->ActiveIdIsAlive;
+    group_data.BackupActiveIdIsAlive = g.ActiveIdIsAlive;
     group_data.AdvanceCursor = true;
 
     window->DC.GroupOffsetX = window->DC.CursorPos.x - window->Pos.x - window->DC.ColumnsOffsetX;
     window->DC.IndentX = window->DC.GroupOffsetX;
     window->DC.CursorMaxPos = window->DC.CursorPos;
     window->DC.CurrentLineHeight = 0.0f;
-    window->DC.LogLinePosY = window->DC.CursorPos.y - 9999.0f;
+    window->DC.LogLinePosY = window->DC.CursorPos.y - 9999.0f; // To enforce Log carriage return
 }
 
 void ImGui::EndGroup()
 {
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
-
     IM_ASSERT(!window->DC.GroupStack.empty());    // Mismatched BeginGroup()/EndGroup() calls
 
     ImGuiGroupData& group_data = window->DC.GroupStack.back();
@@ -12827,11 +12826,11 @@
 
     window->DC.CursorPos = group_data.BackupCursorPos;
     window->DC.CursorMaxPos = ImMax(group_data.BackupCursorMaxPos, window->DC.CursorMaxPos);
-    window->DC.CurrentLineHeight = group_data.BackupCurrentLineHeight;
-    window->DC.CurrentLineTextBaseOffset = group_data.BackupCurrentLineTextBaseOffset;
     window->DC.IndentX = group_data.BackupIndentX;
     window->DC.GroupOffsetX = group_data.BackupGroupOffsetX;
-    window->DC.LogLinePosY = window->DC.CursorPos.y - 9999.0f;
+    window->DC.CurrentLineHeight = group_data.BackupCurrentLineHeight;
+    window->DC.CurrentLineTextBaseOffset = group_data.BackupCurrentLineTextBaseOffset;
+    window->DC.LogLinePosY = window->DC.CursorPos.y - 9999.0f; // To enforce Log carriage return
 
     if (group_data.AdvanceCursor)
     {
diff --git a/imgui_demo.cpp b/imgui_demo.cpp
index 1ec1404..53367a0 100644
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@@ -328,6 +328,7 @@
 
             {
                 // Using the _simplified_ one-liner Combo() api here
+                // See "Combo" section for examples of how to use the more complete BeginCombo()/EndCombo() api.
                 const char* items[] = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO" };
                 static int item_current = 0;
                 ImGui::Combo("combo", &item_current, items, IM_ARRAYSIZE(items));
diff --git a/imgui_internal.h b/imgui_internal.h
index eb07f01..1ef9ce9 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -980,7 +980,7 @@
     ImRect                  OuterRectClipped;                   // = WindowRect just after setup in Begin(). == window->Rect() for root window.
     ImRect                  InnerMainRect, InnerClipRect;
     ImRect                  ContentsRegionRect;                 // FIXME: This is currently confusing/misleading. Maximum visible content position ~~ Pos + (SizeContentsExplicit ? SizeContentsExplicit : Size - ScrollbarSizes) - CursorStartPos, per axis
-    int                     LastFrameActive;
+    int                     LastFrameActive;                    // Last frame number the window was Active.
     float                   ItemWidthDefault;
     ImGuiMenuColumns        MenuColumns;                        // Simplified columns storage for menu items
     ImGuiStorage            StateStorage;