diff --git a/activerecord/lib/active_record/model_schema.rb b/activerecord/lib/active_record/model_schema.rb
index 61da9fdd32..b8f4c54cfa 100644
--- a/activerecord/lib/active_record/model_schema.rb
+++ b/activerecord/lib/active_record/model_schema.rb
@@ -401,7 +401,7 @@ module ActiveRecord
       end
 
       # Returns the column object for the named attribute.
-      # Returns a +ActiveRecord::ConnectionAdapters::NullColumn+ if the
+      # Returns an +ActiveRecord::ConnectionAdapters::NullColumn+ if the
       # named attribute does not exist.
       #
       #   class Person < ActiveRecord::Base
diff --git a/activerecord/lib/active_record/signed_id.rb b/activerecord/lib/active_record/signed_id.rb
index 0cc9f7c2c7..15d8f8adc8 100644
--- a/activerecord/lib/active_record/signed_id.rb
+++ b/activerecord/lib/active_record/signed_id.rb
@@ -47,9 +47,9 @@ module ActiveRecord
         end
       end
 
-      # Works like +find_signed+, but will raise a +ActiveSupport::MessageVerifier::InvalidSignature+
+      # Works like +find_signed+, but will raise an +ActiveSupport::MessageVerifier::InvalidSignature+
       # exception if the +signed_id+ has either expired, has a purpose mismatch, is for another record,
-      # or has been tampered with. It will also raise a +ActiveRecord::RecordNotFound+ exception if
+      # or has been tampered with. It will also raise an +ActiveRecord::RecordNotFound+ exception if
       # the valid signed id can't find a record.
       #
       # === Examples