diff --git a/doc/grammar.txt b/doc/grammar.txt
index 95789872..4e4b5074 100644
--- a/doc/grammar.txt
+++ b/doc/grammar.txt
@@ -3,7 +3,8 @@ CLI Syntax
 The CLI shall have a well-defined and unambiguous grammar.
 
     timew
-    timew start|stop [<tagset>]
+    timew start [<date>] [<tagset>]
+    timew stop [<tagset>]
     timew track <filter>
     timew clear <filter>
     timew continue