diff --git a/docs/features.txt b/docs/features.txt
index 6b502b9d148..705c01bfdb8 100644
--- a/docs/features.txt
+++ b/docs/features.txt
@@ -333,6 +333,7 @@ Khronos, ARB, and OES extensions that are not part of any OpenGL or OpenGL ES ve
   GL_EXT_semaphore_fd                                   DONE (radeonsi, zink, iris, crocus)
   GL_EXT_semaphore_win32                                DONE (zink, d3d12)
   GL_EXT_shader_group_vote                              DONE (all drivers that support GL_ARB_shader_group_vote)
+  GL_EXT_shader_realtime_clock                          DONE (core only)
   GL_EXT_sRGB_write_control                             DONE (all drivers that support GLES 3.0+)
   GL_EXT_texture_compression_astc_decode_mode           DONE (panfrost)
   GL_EXT_texture_norm16                                 DONE (freedreno, r600, radeonsi, nvc0i, softpipe, zink, iris, crocus)