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-rw-r--r--railties/guides/source/active_support_core_extensions.textile2
1 files changed, 1 insertions, 1 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile
index 4cedba1d4d..b7f842a0d0 100644
--- a/railties/guides/source/active_support_core_extensions.textile
+++ b/railties/guides/source/active_support_core_extensions.textile
@@ -444,7 +444,7 @@ NOTE: Defined in +active_support/core_ext/kernel/requires.rb+.
h4. +in?+
-The predicate +in?+ tests if an object is included in another object.
+The predicate +in?+ tests if an object is included in another object. An +ArgumentError+ exception will be raised if the argument passed does not respond to +include?+.
Examples of +in?+: