diff --git a/src/middlewared/middlewared/plugins/snapshot.py b/src/middlewared/middlewared/plugins/snapshot.py
index d6a063b8e88c..6d3e7de5470a 100644
--- a/src/middlewared/middlewared/plugins/snapshot.py
+++ b/src/middlewared/middlewared/plugins/snapshot.py
@@ -294,13 +294,13 @@ async def _validate(self, data):
         if data['dataset'] not in (await self.middleware.call('pool.filesystem_choices')):
             verrors.add(
                 'dataset',
-                'Invalid ZFS dataset'
+                'ZFS dataset or zvol not found'
             )
 
         if not data['recursive'] and data['exclude']:
             verrors.add(
                 'exclude',
-                'Excluding datasets has no sense for non-recursive periodic snapshot tasks'
+                'Excluding datasets is not necessary for non-recursive periodic snapshot tasks'
             )
 
         for i, v in enumerate(data['exclude']):