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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 0a9374e028..a8410a8dd2 100644
--- a/railties/guides/source/active_support_core_extensions.textile
+++ b/railties/guides/source/active_support_core_extensions.textile
@@ -210,7 +210,7 @@ String.new.singleton_class # => #<Class:#<String:0x17a1d1c>>
</ruby>
WARNING: Fixnums and symbols have no singleton classes, +singleton_class+
-raises +TypeError+ on them.
+raises +TypeError+ on them. Moreover, the singleton classes of +nil+, +true+, and +false+, are +NilClass+, +TrueClass+, and +FalseClass+, respectively.
NOTE: Defined in +active_support/core_ext/object/singleton_class.rb+.