diff --git a/doc/rust.md b/doc/rust.md
index 59e8c4a49d3..37d8ccb056e 100644
--- a/doc/rust.md
+++ b/doc/rust.md
@@ -1952,7 +1952,7 @@ for e: foo in v {
 
 ~~~~~~~~{.ebnf .gram}
 if_expr : "if" expr '{' block '}'
-          [ "else" else_tail ] ? ;
+          else_tail ? ;
 
 else_tail : "else" [ if_expr
                    | '{' block '}' ] ;