Add one.

--HG--
branch : HEAD

TODO

diff --git a/TODO b/TODO
index fb44f99..802d6d6 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,6 @@
 + [portability] no off_t in API
 + [portability] use _setmode(_fileno(fp), _O_BINARY); where present
++ [bug] _zip_checkcons return value can overflow
 + [bug] _zip_u2d_time: handle localtime(3) failure
 + [bug] missing -Wl,-R in pkg-config file
 + [bug] check/cleanup flags bit 3 (streaming) support