diff --git a/lib/ansible/modules/utilities/logic/assert.py b/lib/ansible/modules/utilities/logic/assert.py
index ad004db220..a2c6e35672 100644
--- a/lib/ansible/modules/utilities/logic/assert.py
+++ b/lib/ansible/modules/utilities/logic/assert.py
@@ -30,6 +30,10 @@ options:
   msg:
     description:
       - "The customized message used for a failing assertion"
+  success_msg:
+    version_added: "2.7"
+    description:
+      - "The customized message used for a successful assertion"
 notes:
      - This module is also supported for Windows targets.
 author:
@@ -50,4 +54,5 @@ EXAMPLES = '''
       - "my_param <= 100"
       - "my_param >= 0"
     msg: "'my_param' must be between 0 and 100"
+    success_msg: "'my_param' is between 0 and 100"
 '''
diff --git a/lib/ansible/plugins/action/assert.py b/lib/ansible/plugins/action/assert.py
index bf9fc6bb96..26900cf163 100644
--- a/lib/ansible/plugins/action/assert.py
+++ b/lib/ansible/plugins/action/assert.py
@@ -20,6 +20,7 @@ __metaclass__ = type
 from ansible.errors import AnsibleError
 from ansible.playbook.conditional import Conditional
 from ansible.plugins.action import ActionBase
+from ansible.module_utils.six import string_types
 
 
 class ActionModule(ActionBase):
@@ -38,8 +39,11 @@ class ActionModule(ActionBase):
             raise AnsibleError('conditional required in "that" string')
 
         msg = None
-        if 'msg' in self._task.args:
+        success_msg = None
+        if 'msg' in self._task.args and isinstance(self._task.args['msg'], string_types):
             msg = self._task.args['msg']
+        if 'success_msg' in self._task.args and isinstance(self._task.args['success_msg'], string_types):
+            success_msg = self._task.args['success_msg']
 
         # make sure the 'that' items are a list
         thats = self._task.args['that']
@@ -67,5 +71,8 @@ class ActionModule(ActionBase):
                 return result
 
         result['changed'] = False
-        result['msg'] = 'All assertions passed'
+        if success_msg is not None:
+            result['msg'] = success_msg
+        else:
+            result['msg'] = 'All assertions passed'
         return result