diff --git a/CHANGELOG b/CHANGELOG
index 65d50d1e0..d3cd0d6fe 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -7,6 +7,9 @@ https://openslides.org/
 Version 2.1.1 (unreleased)
 ==========================
 
+Agenda:
+ - Fixed issue #3173 that the agenda item text cannot be changed.
+
 
 Version 2.1 (2017-03-29)
 ========================
diff --git a/openslides/topics/serializers.py b/openslides/topics/serializers.py
index f948033fb..d58ac369a 100644
--- a/openslides/topics/serializers.py
+++ b/openslides/topics/serializers.py
@@ -14,5 +14,5 @@ class TopicSerializer(ModelSerializer):
 
     def validate(self, data):
         if 'text' in data:
-            data['text'] = validate_html(['text'])
+            data['text'] = validate_html(data['text'])
         return data