diff --git a/docs/_pages/grammar.md b/docs/_pages/grammar.md
index 628e32ea..ecb32f1a 100644
--- a/docs/_pages/grammar.md
+++ b/docs/_pages/grammar.md
@@ -65,7 +65,7 @@ Type ::=
     SimpleType [`|` Type] |
     SimpleType [`&` Type]
 
-GenericTypeList ::= NAME [`...'] {`,' NAME}
+GenericTypeList ::= NAME [`...'] {`,' NAME [`...']}
 TypeList ::= Type [`,' TypeList] | ...Type
 ReturnType ::= Type | `(' TypeList `)'
 TableIndexer ::= `[' Type `]' `:' Type