diff --git a/api/egl.xml b/api/egl.xml
index 6ec7433..97f390d 100644
--- a/api/egl.xml
+++ b/api/egl.xml
@@ -791,7 +791,9 @@
         <enum value="0x3350" name="EGL_GL_COLORSPACE_SCRGB_LINEAR_EXT"/>
         <enum value="0x3351" name="EGL_GL_COLORSPACE_SCRGB_EXT"/>
         <enum value="0x3352" name="EGL_TRACK_REFERENCES_KHR"/>
-            <unused start="0x3353" end="0x335F"/>
+            <unused start="0x3353" end="0x3356"/>
+        <enum value="0x3357" name="EGL_CONTEXT_PRIORITY_REALTIME_NV"/>
+            <unused start="0x3358" end="0x335F"/>
         <enum value="0x3360" name="EGL_CTA861_3_MAX_CONTENT_LIGHT_LEVEL_EXT"/>
         <enum value="0x3361" name="EGL_CTA861_3_MAX_FRAME_AVERAGE_LEVEL_EXT"/>
         <enum value="0x3362" name="EGL_GL_COLORSPACE_DISPLAY_P3_LINEAR_EXT"/>
@@ -2821,6 +2823,11 @@
                 <enum name="EGL_COVERAGE_SAMPLES_NV"/>
             </require>
         </extension>
+        <extension name="EGL_NV_context_priority_realtime" supported="egl">
+            <require>
+                <enum name="EGL_CONTEXT_PRIORITY_REALTIME_NV"/>
+            </require>
+        </extension>
         <extension name="EGL_NV_coverage_sample_resolve" supported="egl">
             <require>
                 <enum name="EGL_COVERAGE_SAMPLE_RESOLVE_NV"/>
diff --git a/extensions/NV/EGL_NV_context_priority_realtime.txt b/extensions/NV/EGL_NV_context_priority_realtime.txt
new file mode 100644
index 0000000..5435c8c
--- /dev/null
+++ b/extensions/NV/EGL_NV_context_priority_realtime.txt
@@ -0,0 +1,195 @@
+Name
+
+    NV_context_priority_realtime
+
+Name Strings
+
+    EGL_NV_context_priority_realtime
+
+Contributors
+
+    Sandeep Shinde
+    Kirill Artamonov
+    Sami Kiminki
+    Donghan Ryu
+    Daniel Koch
+    Mark Kilgard
+
+Contacts
+
+    Sandeep Shinde, NVIDIA (sashinde 'at' nvidia 'dot' com)
+
+Status
+
+    Complete
+
+Version
+
+    Version 4 - November 21, 2017
+
+Number
+
+    EGL Extension #124
+
+Dependencies
+
+    Requires EGL 1.0.
+
+    Requires EGL_IMG_context_priority
+
+    This extension is written against the wording of the EGL 1.5
+    Specification - August 27, 2014 (but may be implemented against earlier
+    versions).
+
+Overview
+
+    This extension allows an EGLContext to be created with one extra
+    priority level in addition to three priority levels that are part of
+    EGL_IMG_context_priority extension.
+
+    This new level has extra privileges that are not available to other three
+    levels. Some of the privileges may include:
+    - Allow realtime priority to only few contexts
+    - Allow realtime priority only to trusted applications
+    - Make sure realtime priority contexts are executed immediately
+    - Preempt any current context running on GPU on submission of
+      commands for realtime context
+
+    The mechanism for determining which EGL context is allowed to use this
+    priority level is platform dependent.
+
+New Types
+
+    None
+
+New Procedures and Functions
+
+    None
+
+New Tokens
+
+    New attribute value accepted for the EGL_CONTEXT_PRIORITY_LEVEL_IMG
+    attribute in the <attrib_list> argument of eglCreateContext:
+
+        EGL_CONTEXT_PRIORITY_REALTIME_NV         0x3357
+
+Additions to Chapter 3 of the EGL 1.5 Specification (EGL Functions and Errors)
+
+    Add a NEW section "3.7.1.7 Context Priority" to specify the context
+    priority attribute for EGL_IMG_context_priority and values:
+
+    "3.7.1.7 Context Priority
+
+    The attribute EGL_CONTEXT_PRIORITY_LEVEL_IMG specifies a context
+    priority hint for a context supporting context priority.  This
+    attribute's value may be one of EGL_CONTEXT_PRIORITY_HIGH_IMG,
+    EGL_CONTEXT_PRIORITY_MEDIUM_IMG, EGL_CONTEXT_PRIORITY_LOW_IMG,
+    or EGL_CONTEXT_PRIORITY_REALTIME_NV.  The default value for
+    EGL_CONTEXT_PRIORITY_LEVEL_IMG is EGL_CONTEXT_PRIORITY_MEDIUM_IMG.
+
+    This attribute is a hint, as an implementation may not support
+    multiple contexts at some priority levels and system policy may limit
+    access to high priority contexts to appropriate system privilege
+    level.
+
+    The value EGL_CONTEXT_PRIORITY_REALTIME_NV requests the created
+    context run at the highest possible priority and be capable of
+    preempting the current executing context when commands are flushed
+    by such a realtime context.
+
+    This attribute is supported only for OpenGL and OpenGL ES contexts."
+
+    Within section 3.7.4 "Context Queries" amend the eglQueryContext
+    discussion as follows:
+
+    Change the sentence describing the attribute parameter to include
+    EGL_CONTEXT_PRIORITY_LEVEL_IMG so it reads:
+
+    "attribute must be set to EGL_CONFIG_ID, EGL_CONTEXT_CLIENT_TYPE,
+    EGL_CONTEXT_CLIENT_VERSION, EGL_RENDER_BUFFER, or
+     EGL_CONTEXT_PRIORITY_LEVEL_IMG."
+
+    After the discussion of "Querying EGL_RENDER_BUFFER", add:
+
+    "Querying EGL_CONTEXT_PRIORITY_LEVEL_IMG returns the priority this
+    context was actually created with. Note: this may not be the same
+    as specified at context creation time, due to implementation limits
+    on the number of contexts that can be created at a specific priority
+    level in the system."
+
+Issues
+
+    1)  The EGL_IMG_context_priority extension is written to amend the EGL
+        1.4 specification.  Should this extension amend EGL 1.5 or 1.4?
+
+        RESOLVED:  EGL 1.5 because it is newer and better organized to
+        extend context attributes.
+
+        EGL 1.5 rewrites 3.7.1 "Creating Rendering Contexts" to have subsections
+        for different context attributes.  This extension adds a new such section
+        that includes the EGL_IMG_context_priority attribute and values too.
+
+    2)  Is context priority hint supported for both OpenGL and OpenGL ES contexts?
+
+        RESOLVED:  Yes.
+
+    3)  What is the intended application of the realtime priority level?
+
+        RESOLVED:  One anticipated application is the system compositor
+        for a Head Mounted Display (HMD) requires realtime recomposition
+        for time-warping.
+
+    4)  What action causes a context with realtime priority to preempt
+        other contexts?
+
+        RESOLVED:  Preemption by a context with realtime priority should
+        occur when there are pending rendering commands and an implicit or
+        explicit flush (i.e. glFlush or glFinish) occurs.
+
+    5)  What does "trusted" or "appropriate system privilege level"
+        mean in practice for a Linux-based operating system such as Android?
+
+        RESOLVED: Trusted means an application that has higher privileges
+        than other apps such as having CAP_SYS_NICE capability. On Android
+        such applications have to be registered in advance with the OS;
+        unpriviledged third party app cannot acquire this capability.
+
+        This restriction exists so arbitrary applications do not starve or
+        otherwise compromise the interactivity of the system overall.
+
+    6)  In practice how many realtime priority contexts can exist in a system to
+        get best performance?
+
+        RESOLVED: Only one realtime priority context should be active at a given
+        moment to get best performance.
+
+    7)  Can a context created with a realtime priority hint that is
+        in fact given a realtime priority, subsequently find that realtime
+        priority revoked and, if revoked, can it be restored?
+
+        RESOLVED: No, once a context is created with specific priority level, the
+        priority will not change for lifetime of the context. This means there will
+        not be revoking or restoring of realtime priority to already created context.
+
+    8)  The attrib_list for eglCreateContext could list the attribute
+        EGL_CONTEXT_PRIORITY_LEVEL_IMG multiple times with different valid values.
+        What happens in this case?
+
+        RESOLVED: Behavior is undefined in this case.
+
+        NVIDIA's EGL implementation handles such case by using the last (valid) attribute
+        value listed in the attrib_list array as the effective attribute value for
+        creating the context.
+
+        The EGL specification is unfortunately silent on this issue.
+
+
+Revision History
+    Version 1,  2016/11/23 (Sandeep Shinde)
+        - Initial version
+    Version 2,  2017/10/13 (Mark Kilgard)
+        - Complete and convert to NV extension
+    Version 3, 2017/10/31 (Sandeep Shinde)
+        - Few minor corrections. Issue 6 resolved.
+    Version 4, 2017/11/21 (Sandeep Shinde)
+        - Update enum value and add extension number
diff --git a/index.php b/index.php
index 442d86d..03da013 100644
--- a/index.php
+++ b/index.php
@@ -313,6 +313,8 @@
 </li>
 <li value=123> <a href="extensions/ANDROID/EGL_ANDROID_get_native_client_buffer.txt">EGL_ANDROID_get_native_client_buffer</a>
 </li>
+<li value=124> <a href="extensions/NV/EGL_NV_context_priority_realtime.txt">EGL_NV_context_priority_realtime</a>
+</li>
 </ol>
 
 <h6> Providing Feedback on the Registry </h6>
diff --git a/registry.tcl b/registry.tcl
index f4367af..aa9fd63 100644
--- a/registry.tcl
+++ b/registry.tcl
@@ -644,4 +644,9 @@
     flags       public
     filename    extensions/ANDROID/EGL_ANDROID_get_native_client_buffer.txt
 }
-# Next free extension number: 124
+extension EGL_NV_context_priority_realtime {
+    number      124
+    flags       public
+    filename    extensions/NV/EGL_NV_context_priority_realtime.txt
+}
+# Next free extension number: 125