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-rw-r--r--activemodel/lib/active_model/validations/length.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/validations/length.rb b/activemodel/lib/active_model/validations/length.rb
index eb7aac709d..6bc928bab7 100644
--- a/activemodel/lib/active_model/validations/length.rb
+++ b/activemodel/lib/active_model/validations/length.rb
@@ -23,7 +23,7 @@ module ActiveModel
keys = CHECKS.keys & options.keys
if keys.empty?
- raise ArgumentError, 'Range unspecified. Specify the :within, :maximum, :minimum, or :is option.'
+ raise ArgumentError, 'Range unspecified. Specify the :in, :within, :maximum, :minimum, or :is option.'
end
keys.each do |key|