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diff --git a/haskell/haskell-Diff/README b/haskell/haskell-Diff/README
index 9ff285a85b..511f88d437 100644
--- a/haskell/haskell-Diff/README
+++ b/haskell/haskell-Diff/README
@@ -1,3 +1,6 @@
Basic implementation of the standard O(ND) diff algorithm.
This requires ghc.
+
+After uninstalling, run this command to unregister the package from
+the ghc package database: ghc-pkg recache