point to the wiki

diff --git a/compiler/main/TidyPgm.lhs b/compiler/main/TidyPgm.lhs
index ebe196b..2a068d9 100644 (file)
--- a/compiler/main/TidyPgm.lhs
+++ b/compiler/main/TidyPgm.lhs
@@ -207,6 +207,10 @@ Step 1: Figure out external Ids
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Note [choosing external names]
 
+See also the section "Interface stability" in the
+RecompilationAvoidance commentary:
+  http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/RecompilationAvoidance
+
 First we figure out which Ids are "external" Ids.  An
 "external" Id is one that is visible from outside the compilation
 unit.  These are