diff --git a/psGrammar/confirm/confirm.jsgf b/psGrammar/confirm/confirm.jsgf
index b6948911f92d43e770283414b860a394786f02f6..530ea50065a4ef17897aa549c3b5765f67bf8ce9 100644
--- a/psGrammar/confirm/confirm.jsgf
+++ b/psGrammar/confirm/confirm.jsgf
@@ -5,6 +5,6 @@ public <confirm> = <confirm_yes> | <confirm_no>;
 <confirm_yes> = <robot> <yes_words>;
 <confirm_no> = <robot> <no_words>; 
 
-<yes_words> = (yes) | (confirmed);
+<yes_words> = (yes);
 <no_words> = (no);
-<robot> = (tobi) | (robot) | (biron) | (pepper) | (tiago);
+<robot> = (tiago);
diff --git a/psGrammar/confirm/confirm_old.jsgf b/psGrammar/confirm/confirm_old.jsgf
new file mode 100644
index 0000000000000000000000000000000000000000..b6948911f92d43e770283414b860a394786f02f6
--- /dev/null
+++ b/psGrammar/confirm/confirm_old.jsgf
@@ -0,0 +1,10 @@
+#JSGF V1.0;
+grammar ToBI_confirm;
+public <confirm> = <confirm_yes> | <confirm_no>;
+
+<confirm_yes> = <robot> <yes_words>;
+<confirm_no> = <robot> <no_words>; 
+
+<yes_words> = (yes) | (confirmed);
+<no_words> = (no);
+<robot> = (tobi) | (robot) | (biron) | (pepper) | (tiago);