diff --git a/psGrammar/demos/demoErsti/commands.jsgf b/psGrammar/demos/demoErsti/commands.jsgf
index 81b71a4c1c36a5bfd30dd77b81b61c04d16fe9ec..d417b35af71191cd645b0fd4161382f8676b3134 100644
--- a/psGrammar/demos/demoErsti/commands.jsgf
+++ b/psGrammar/demos/demoErsti/commands.jsgf
@@ -34,4 +34,6 @@ public <command> = [<robot>] ( <introduce> | <save> | <wait> | <goTo> | <followM
 
 <count> = (count the people);
 
-<explain> = (what can you do) | (explain your skills);
\ No newline at end of file
+<explain> = (what can you do) | (explain your skills);
+
+<store_groceries> = (store the groceries)
\ No newline at end of file