diff --git a/lib/buffer.h b/lib/buffer.h
index 2acd571..65b8a8c 100644
--- a/lib/buffer.h
+++ b/lib/buffer.h
@@ -29,7 +29,8 @@
   /* Data list. */
   struct buffer_data *head;
   struct buffer_data *tail;
-
+  
+  /* XXX: These unsigned longs should be size_t's */
   /* Current allocated data. */
   unsigned long alloc;