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-rw-r--r--railties/guides/source/active_support_overview.textile2
1 files changed, 1 insertions, 1 deletions
diff --git a/railties/guides/source/active_support_overview.textile b/railties/guides/source/active_support_overview.textile
index abb7ca9491..0462b47ec6 100644
--- a/railties/guides/source/active_support_overview.textile
+++ b/railties/guides/source/active_support_overview.textile
@@ -1382,7 +1382,7 @@ The method +diff+ returns a hash that represents a diff of the receiver and the
An important property of this diff hash is that you can retrieve the original hash by applying +diff+ twice:
<ruby>
-hash1.diff(hash2).diff(hash2) == hash1
+hash.diff(hash2).diff(hash2) == hash1
</ruby>
Diffing hashes may be useful for error messages related to expected option hashes for example.