diff --git a/ps-grammar/demoChallenge/commands.jsgf b/ps-grammar/demoChallenge/commands.jsgf
index c0dd6accd7677daffaa36d048f844e09440683be..cc1192d29ec462b67ebb89cee69b9957da1102fa 100644
--- a/ps-grammar/demoChallenge/commands.jsgf
+++ b/ps-grammar/demoChallenge/commands.jsgf
@@ -1,8 +1,10 @@
 #JSGF V1.0;
 grammar bebot_demo;
-public <statement> = [tobi] [please] <command> [please] [tobi];
+public <statement> = [tobi] [please] ( <command> | <teach> ) [please] [tobi];
 
 <command> = <clean> | <party>;
 <clean> = clean up | start cleaning;
 <party> = [the] party starts | party beginning;
+<teach> = ( (this is [a | an | the] ) | ( these are [the] ) ) <object>;
+<object> = [other] ( trashbin  );