diff --git a/doc/intern.rst b/doc/intern.rst
index b253cac422..1c20eeed72 100644
--- a/doc/intern.rst
+++ b/doc/intern.rst
@@ -8,7 +8,7 @@
 
 .. contents::
 
-  "Abstraction is layering ignorance on top of reality." -- unknown
+  "Abstraction is layering ignorance on top of reality." -- Richard Gabriel
 
 
 Directory structure