diff --git a/mps/design/config.txt b/mps/design/config.txt
index 54c9da1bf39..38cca8f1bb7 100644
--- a/mps/design/config.txt
+++ b/mps/design/config.txt
@@ -581,6 +581,7 @@ Document History
 
 .. _RB: http://www.ravenbrook.com/consultants/rb/
 .. _NB: http://www.ravenbrook.com/consultants/nb/
+.. _GDR: http://www.ravenbrook.com/consultants/gdr/
 
 
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