diff --git a/GHC/Integer/Type.hs b/GHC/Integer/Type.hs
index 703301c1813f1170ed1b8558baeff86c9e6c8927..88b1c4c4503088267bee83efcea420978f8f2b97 100644
--- a/GHC/Integer/Type.hs
+++ b/GHC/Integer/Type.hs
@@ -3,6 +3,11 @@
              NoImplicitPrelude, BangPatterns, UnboxedTuples,
              UnliftedFFITypes #-}
 
+-- Commentary of Integer library is located on the wiki:
+-- http://ghc.haskell.org/trac/ghc/wiki/Commentary/Libraries/Integer
+--
+-- It gives an in-depth description of implementation details and
+-- decisions.
 
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