diff --git a/common/lib/xmodule/xmodule/capa_module.py b/common/lib/xmodule/xmodule/capa_module.py
index 27641af3b5..cfe3d2d48b 100644
--- a/common/lib/xmodule/xmodule/capa_module.py
+++ b/common/lib/xmodule/xmodule/capa_module.py
@@ -462,14 +462,14 @@ class CapaModule(XModule):
             self.system.track_function('save_problem_check_fail', event_info)
             raise NotFoundError('Problem must be reset before it can be checked again')
 
-        # Problem queued. Students must wait XQUEUE_WAITTIME_BETWEEN_REQUESTS
+        # Problem queued. Students must wait a specified waittime before they are allowed to submit
         if self.lcp.is_queued():
             current_time = datetime.datetime.now()
             prev_submit_time = self.lcp.get_recentmost_queuetime() 
             waittime_between_requests = self.system.xqueue['waittime']
             if (current_time-prev_submit_time).total_seconds() < waittime_between_requests:
                 msg = 'You must wait at least %d seconds between submissions' % waittime_between_requests
-                return {'success': msg, 'html': ''}
+                return {'success': msg, 'html': ''} # Prompts a modal dialog in ajax callback 
 
         try:
             old_state = self.lcp.get_state()