diff --git a/src/bin/bigtool/run_bigtool.py b/src/bin/bigtool/run_bigtool.py
index e5c436454d..c15310d120 100644
--- a/src/bin/bigtool/run_bigtool.py
+++ b/src/bin/bigtool/run_bigtool.py
@@ -32,9 +32,9 @@ def _prepare_fake_data(bigtool):
 if __name__ == '__main__':
     try:
         cc = ISC.CC.Session()
-        cc.group_subscribe("BigTool")
-        cc.group_subscribe("ConfigManager")
-        cc.group_subscribe("Boss")
+        cc.group_subscribe("BigTool", "*", "meonly")
+        cc.group_subscribe("ConfigManager", "*", "meonly")
+        cc.group_subscribe("Boss", "*", "meonly")
 
         tool = BigTool(cc)
         _prepare_fake_data(tool)   
diff --git a/src/lib/cc/python/ISC/CC/session.py b/src/lib/cc/python/ISC/CC/session.py
index 80d1f6d78e..b285127c74 100644
--- a/src/lib/cc/python/ISC/CC/session.py
+++ b/src/lib/cc/python/ISC/CC/session.py
@@ -103,6 +103,7 @@ class Session:
         return self._sequence
 
     def group_subscribe(self, group, instance = "*", subtype = "normal"):
+        """subtype can be 'normal' or 'meonly'"""
         self.sendmsg({
             "type": "subscribe",
             "group": group,