diff --git a/GRAMMAR.md b/GRAMMAR.md
index 89ebe71..be60fdd 100644
--- a/GRAMMAR.md
+++ b/GRAMMAR.md
@@ -41,6 +41,7 @@ grammar
 justfile      : item* EOF
 
 item          : recipe
+              | alias
               | assignment
               | export
               | eol
@@ -50,6 +51,8 @@ eol           : NEWLINE
 
 assignment    : NAME '=' expression eol
 
+alias         : 'alias' NAME '=' NAME
+
 export        : 'export' assignment
 
 expression    : value '+' expression