diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -1902,7 +1902,10 @@ def savename(path):
     return newpath
 
 def push(ui, repo, patch=None, **opts):
-    """push the next patch onto the stack"""
+    """push the next patch onto the stack
+    
+    When --force is applied, all local changes in patched files will be lost.
+    """
     q = repo.mq
     mergeq = None