diff --git a/include/swift/AST/TypeRepr.h b/include/swift/AST/TypeRepr.h
index c9fce95d9e67a..4f5d3678d0c32 100644
--- a/include/swift/AST/TypeRepr.h
+++ b/include/swift/AST/TypeRepr.h
@@ -393,7 +393,7 @@ class FunctionTypeRepr : public TypeRepr {
 /// \endcode
 class ArrayTypeRepr : public TypeRepr {
   // FIXME: Tail allocation. Use bits to determine whether Base/Size are
-  // availble.
+  // available.
   TypeRepr *Base;
   llvm::PointerIntPair<ExprHandle *, 1, bool> SizeAndOldSyntax;
   SourceRange Brackets;