1 files changed, 2 insertions, 1 deletions
diff --git a/lib/parser.mly b/lib/parser.mly
index c85eccc..4bac905 100644
--- a/lib/parser.mly
+++ b/lib/parser.mly
@@ -8,7 +8,7 @@ open Ast
 %token <string> NAME
 %token <string> LABEL
 %token LBRACKET RBRACKET LBRACE RBRACE LPAREN RPAREN HASH_LPAREN
-%token BAR AND OR EOF
+%token BAR AND OR NOT EOF
 
 %start <Ast.statement list> program
 
@@ -32,6 +32,7 @@ node:
 
 conjunction:
   | left = conjunction; AND; right = operand { And (left, right) }
+  | left = conjunction; NOT; right = operand { Not (left, right) }
   | operand = operand                        { operand }
 
 operand: