diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97d7a11..5fcae1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
 
+## v1.1.X
+
+## Enhancements
+* Ensure to not override groups of 'xymon' user.
+
 ## v1.1
 
 ## Enhancements
diff --git a/tasks/main.yml b/tasks/main.yml
index b92576d..2d9bd46 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -32,6 +32,7 @@
   user:
     name: xymon
     groups: '{{ xymon_user_groups }}'
+    append: True
   notify: restart xymon-client service
 
 ## service