diff --git a/src/pygitversionhelper/gitversionhelper.py b/src/pygitversionhelper/gitversionhelper.py
index 16db1e6..502d2ff 100644
--- a/src/pygitversionhelper/gitversionhelper.py
+++ b/src/pygitversionhelper/gitversionhelper.py
@@ -165,8 +165,8 @@ class gitversionhelper: # pylint: disable=too-few-public-methods
                 f"""
                 bump the version to the next one
                 Kwargs:
-                    {cls.__OptDict["bump_type"]}: the given bump_type (can be None)
-                    {cls.__OptDict["bump_dev_strategy"]}: the given bump_dev_strategy (can be None)
+                    {self.__OptDict["bump_type"]}: the given bump_type (can be None)
+                    {self.__OptDict["bump_dev_strategy"]}: the given bump_dev_strategy (can be None)
                 Return:
                     the bumped version
                 """