1 files changed, 5 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/blank.rb b/activesupport/lib/active_support/core_ext/object/blank.rb
index d0c1ea8326..76450a9238 100644
--- a/activesupport/lib/active_support/core_ext/object/blank.rb
+++ b/activesupport/lib/active_support/core_ext/object/blank.rb
@@ -37,7 +37,11 @@ class Object
   end
 end
 
-class NilClass #:nodoc:
+class NilClass
+  # Instances of NilClass are always blank
+  # Example:
+  #
+  # nil.blank? => true
   def blank?
     true
   end