diff --git a/lexer/token.go b/lexer/token.go
index 06e26c3..2bfb2e6 100644
--- a/lexer/token.go
+++ b/lexer/token.go
@@ -47,9 +47,13 @@ const (
 
 	// TODO: add equal to, less than or equal to, greater than or equal to,
 	// not equal to
+        TokenKindEqualTo
+        TokenKindNotEqualTo
+        TokenKindLessThanEqualTo
         TokenKindLessThan
         TokenKindLShift
         TokenKindGreaterThan
+        TokenKindGreaterThanEqualTo
         TokenKindRShift
         TokenKindBinaryOr
         TokenKindLogicalOr