diff --git a/src/internal.h b/src/internal.h
index 83559ecc..2d38912c 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -59,6 +59,10 @@
 #include "config.h"
 
 #include "../include/GL/glfw3.h"
+
+// This path may need to be changed if you build GLFW using your own setup
+// We ship and use our own copy of glext.h since GLFW uses fairly new
+// extensions and not all operating systems come with an up-to-date version
 #include "../support/GL/glext.h"
 
 #if defined(_GLFW_COCOA_NSGL)
diff --git a/src/win32_platform.h b/src/win32_platform.h
index db5b82ae..a2b94ebc 100644
--- a/src/win32_platform.h
+++ b/src/win32_platform.h
@@ -43,6 +43,9 @@
 #include <windows.h>
 #include <mmsystem.h>
 
+// This path may need to be changed if you build GLFW using your own setup
+// We ship and use our own copy of wglext.h since GLFW uses fairly new
+// extensions and not all operating systems come with an up-to-date version
 #include "../support/GL/wglext.h"
 
 
diff --git a/src/x11_platform.h b/src/x11_platform.h
index 70a57b84..46f09f1a 100644
--- a/src/x11_platform.h
+++ b/src/x11_platform.h
@@ -41,6 +41,9 @@
 #define GLX_GLXEXT_LEGACY
 #include <GL/glx.h>
 
+// This path may need to be changed if you build GLFW using your own setup
+// We ship and use our own copy of glxext.h since GLFW uses fairly new
+// extensions and not all operating systems come with an up-to-date version
 #include "../support/GL/glxext.h"