4 files changed, 12 insertions, 0 deletions
diff --git a/lib/sqlalchemy/dialects/postgresql/array.py b/lib/sqlalchemy/dialects/postgresql/array.py
index 1b036ac32..3cb60d3f3 100644
--- a/lib/sqlalchemy/dialects/postgresql/array.py
+++ b/lib/sqlalchemy/dialects/postgresql/array.py
@@ -221,6 +221,9 @@ class ARRAY(sqltypes.ARRAY):
         def contains(self, other, **kwargs):
             """Boolean expression.  Test if elements are a superset of the
             elements of the argument array expression.
+
+            kwargs may be ignored by this operator but are required for API
+            conformance.
             """
             return self.operate(CONTAINS, other, result_type=sqltypes.Boolean)
 
diff --git a/lib/sqlalchemy/dialects/postgresql/hstore.py b/lib/sqlalchemy/dialects/postgresql/hstore.py
index 30e2d4bc2..a4090f1ac 100644
--- a/lib/sqlalchemy/dialects/postgresql/hstore.py
+++ b/lib/sqlalchemy/dialects/postgresql/hstore.py
@@ -170,6 +170,9 @@ class HSTORE(sqltypes.Indexable, sqltypes.Concatenable, sqltypes.TypeEngine):
         def contains(self, other, **kwargs):
             """Boolean expression.  Test if keys (or array) are a superset
             of/contained the keys of the argument jsonb expression.
+
+            kwargs may be ignored by this operator but are required for API
+            conformance.
             """
             return self.operate(CONTAINS, other, result_type=sqltypes.Boolean)
 
diff --git a/lib/sqlalchemy/dialects/postgresql/json.py b/lib/sqlalchemy/dialects/postgresql/json.py
index 2277d3cbe..2acf177f5 100644
--- a/lib/sqlalchemy/dialects/postgresql/json.py
+++ b/lib/sqlalchemy/dialects/postgresql/json.py
@@ -310,6 +310,9 @@ class JSONB(JSON):
         def contains(self, other, **kwargs):
             """Boolean expression.  Test if keys (or array) are a superset
             of/contained the keys of the argument jsonb expression.
+
+            kwargs may be ignored by this operator but are required for API
+            conformance.
             """
             return self.operate(CONTAINS, other, result_type=sqltypes.Boolean)
 
diff --git a/lib/sqlalchemy/dialects/postgresql/ranges.py b/lib/sqlalchemy/dialects/postgresql/ranges.py
index f251a04bd..c54179c81 100644
--- a/lib/sqlalchemy/dialects/postgresql/ranges.py
+++ b/lib/sqlalchemy/dialects/postgresql/ranges.py
@@ -42,6 +42,9 @@ class RangeOperators(object):
             """Boolean expression. Returns true if the right hand operand,
             which can be an element or a range, is contained within the
             column.
+
+            kwargs may be ignored by this operator but are required for API
+            conformance.
             """
             return self.expr.op("@>", is_comparison=True)(other)