diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index 77d17fc9757bcbbc63267c2e408b4dbe8ab5d930..fe440fccc7398d2cd0b4f04f700c62cc76ba2b0a 100644
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -318,7 +318,7 @@ def association_instance_set(name, association)
     #   create_other(attributes={})       |     X      |              |    X
     #   create_other!(attributes={})      |     X      |              |    X
     #
-    # ===Collection associations (one-to-many / many-to-many)
+    # === Collection associations (one-to-many / many-to-many)
     #                                     |       |          | has_many
     #   generated methods                 | habtm | has_many | :through
     #   ----------------------------------+-------+----------+----------