-**apitrace** will advertise and intercept these GL extensions independently of
-the GL implementation. So all you have to do is to use these extensions when
-available.
+* [`GL_AMD_debug_output`](http://www.opengl.org/registry/specs/AMD/debug_output.txt)
+
+* [`GL_GREMEDY_string_marker`](http://www.opengl.org/registry/specs/GREMEDY/string_marker.txt)
+
+* [`GL_GREMEDY_frame_terminator`](http://www.opengl.org/registry/specs/GREMEDY/frame_terminator.txt)
+
+**apitrace** will advertise and intercept these GL extensions regardless the GL
+implementation supports them or not. So all you have to do is to use these
+extensions when available, and you can be sure they will be available when
+tracing inside **apitrace**.