diff --git a/psGrammar/demos/demoErsti/commands.jsgf b/psGrammar/demos/demoErsti/commands.jsgf
index d360c3e5f9938b55163c3f177ee0e7586e56268b..3234a3cbb9ea46ae01f0d9bf6cbff54ce62cbd81 100644
--- a/psGrammar/demos/demoErsti/commands.jsgf
+++ b/psGrammar/demos/demoErsti/commands.jsgf
@@ -1,7 +1,7 @@
 #JSGF V1.0;
 grammar commands;
 
-public <command> = [<robot>] ( <introduce> | <save> | <wait> | <goTo> | <followMe> | <followHand> | <gravity> | <exit> | <lookAt> | <trash> | <drop> | <nothing> | <search> | <describe> | <difference> | <take> | <give> | <count> | <explain> );
+public <command> = [<robot>] ( <introduce> | <save> | <wait> | <goTo> | <followMe> | <followHand> | <gravity> | <exit> | <lookAt> | <trash> | <drop> | <nothing> | <search> | <describe> | <difference> | <take> | <give> | <count> | <explain> | <store_groceries> );
 
 <robot> = (tobi | robot | tiago);