diff --git a/pandas/tests/arithmetic/common.py b/pandas/tests/arithmetic/common.py
index d7a8b0510b50f..0730729e2fd94 100644
--- a/pandas/tests/arithmetic/common.py
+++ b/pandas/tests/arithmetic/common.py
@@ -20,13 +20,16 @@
 
 def assert_cannot_add(left, right, msg="cannot add"):
     """
-    Helper to assert that left and right cannot be added.
+    Helper function to assert that two objects cannot be added.
 
     Parameters
     ----------
     left : object
+        The first operand.
     right : object
+        The second operand.
     msg : str, default "cannot add"
+        The error message expected in the TypeError.
     """
     with pytest.raises(TypeError, match=msg):
         left + right
@@ -36,13 +39,17 @@ def assert_cannot_add(left, right, msg="cannot add"):
 
 def assert_invalid_addsub_type(left, right, msg=None):
     """
-    Helper to assert that left and right can be neither added nor subtracted.
+    Helper function to assert that two objects can
+    neither be added nor subtracted.
 
     Parameters
     ----------
     left : object
+        The first operand.
     right : object
+        The second operand.
     msg : str or None, default None
+        The error message expected in the TypeError.
     """
     with pytest.raises(TypeError, match=msg):
         left + right