diff --git a/Control/DeepSeq.hs b/Control/DeepSeq.hs
index 9f60d88d076c9ea95ec78ff5832e9307ffa32a27..4213e92ad24740cbda7fb792ebf51bfd59a66002 100644
--- a/Control/DeepSeq.hs
+++ b/Control/DeepSeq.hs
@@ -208,7 +208,7 @@ class NFData a where
     --
     -- === Compatibility with previous @deepseq@ versions
     --
-    -- Prior to version 1.4.0, the default implementation of the 'rnf'
+    -- Prior to version 1.4.0.0, the default implementation of the 'rnf'
     -- method was defined as
     --
     -- @'rnf' a = 'seq' a ()@