diff --git a/secop/persistent.py b/secop/persistent.py
index 57a5190..d426463 100644
--- a/secop/persistent.py
+++ b/secop/persistent.py
@@ -144,5 +144,6 @@ class PersistentMixin(HasAccessibles):
 
     @Command()
     def factory_reset(self):
+        """reset to initial values, forget persistent data"""
         self.writeDict.update(self.initData)
         self.writeInitParams()