Add TODO
diff --git a/src/hb-open-type-private.hh b/src/hb-open-type-private.hh
index d7354be..1a11cd1 100644
--- a/src/hb-open-type-private.hh
+++ b/src/hb-open-type-private.hh
@@ -366,6 +366,8 @@
 
 template <typename Type, int Bytes> class BEInt;
 
+/* LONGTERMTODO: On machines allowing unaligned access, we can make the
+ * following tighter by using byteswap instructions on ints directly. */
 template <typename Type>
 class BEInt<Type, 2>
 {