docs: added link to wiki page about missing Mesa features
diff --git a/docs/GL3.txt b/docs/GL3.txt
index f25459d..8ca4e7b 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -60,3 +60,6 @@
 Fence objects (GL_ARB_sync)                           DONE
 
 
+
+More info about these features and the work involved can be found at
+http://dri.freedesktop.org/wiki/MissingFunctionality