diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 140e21b5d04b7..06060cf79f2c4 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -1244,7 +1244,7 @@ pub struct BareFnTy {
 /// The different kinds of types recognized by the compiler
 pub enum Ty_ {
     TyVec(P<Ty>),
-    /// A fixed length array (`[T, ..n]`)
+    /// A fixed length array (`[T; n]`)
     TyFixedLengthVec(P<Ty>, P<Expr>),
     /// A raw pointer (`*const T` or `*mut T`)
     TyPtr(MutTy),