diff --git a/psGrammar/tasks/manipulation/manipulationTask.jsgf b/psGrammar/tasks/manipulation/manipulationTask.jsgf
index 530f96c0a5092a5e7d79e88f2fdf3b8a73e338ae..e56afcbfa028b4f6d2f563d8391a8e6d3ff8933c 100644
--- a/psGrammar/tasks/manipulation/manipulationTask.jsgf
+++ b/psGrammar/tasks/manipulation/manipulationTask.jsgf
@@ -1,7 +1,7 @@
 #JSGF V1.0;
 grammar manipulationTask;
 
-public <navigation> = (tobi | biron) [please] ( clean the <cleanShelf> | <table>);
+public <navigation> = (tobi | biron) [please] ( [clean the] <cleanShelf> | [clean the] <table>);
 
 <cleanShelf> = (shelf);
 <table> = (table);