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diff --git a/parser/grammar b/parser/grammar
index b88b9ed..14753c8 100644
--- a/parser/grammar
+++ b/parser/grammar
@@ -10,7 +10,7 @@
 #  !(TAG | TAG)
 # Allowed operators: conjunction - & && AND and
 #                    disjunction - | || OR or
-#                    negation    - !
+#                    negation    - ! NOT not
 # This  is a simple version of the grammar and it allows
 # rather stupid expressions, like !!TAG or ((TAG)); in the future
 # it will be fixed by making the grammar more complex and stricter.
@@ -33,6 +33,7 @@ expression : NAME
            | expression SP0 OR_OP SP0 expression
            | l_expression or_word r_expression
            | NOT_OP SP0 expression
+           | not_word r_expression
            | expression_parens
 
 l_expression : expression_parens
@@ -53,6 +54,9 @@ and_word : 'A' 'N' 'D'
 or_word : 'O' 'R'
         | 'o' 'r'
 
+not_word : 'N' 'O' 'T'
+         | 'n' 'o' 't'
+
 SP0 : SP1 | empty
 
 empty :