diff --git a/oml/cache.py b/oml/cache.py
index 18010ab..dd0e823 100644
--- a/oml/cache.py
+++ b/oml/cache.py
@@ -23,3 +23,8 @@ class Cache(dict):
         if key in self._added:
             del self._added[key]
             del self[key]
+
+    def clear(self, prefix):
+        for key in list(self):
+            if key.startswith(prefix):
+                self.delete(key)
diff --git a/oml/item/api.py b/oml/item/api.py
index c0aa61c..da4507c 100644
--- a/oml/item/api.py
+++ b/oml/item/api.py
@@ -140,9 +140,7 @@ def edit(data):
     if len(ids) > 1:
         response = data
         response['id'] = edited
-    for key in list(state.cache):
-        if key.startswith('group:'):
-            state.cache.delete(key)
+    state.cache.clear('group:')
     return response
 actions.register(edit, cache=False)
 
diff --git a/oml/user/api.py b/oml/user/api.py
index 4578a24..74c44b7 100644
--- a/oml/user/api.py
+++ b/oml/user/api.py
@@ -233,6 +233,7 @@ def addListItems(data):
         l = models.List.get_or_create(data['list'])
         if l:
             l.add_items(data['items'])
+            state.cache.clear('group:')
             return l.json()
     return {}
 actions.register(addListItems, cache=False)
@@ -248,6 +249,7 @@ def removeListItems(data):
     l = models.List.get(data['list'])
     if l:
         l.remove_items(data['items'])
+        state.cache.clear('group:')
         return l.json()
     return {}
 actions.register(removeListItems, cache=False)