diff --git a/TODO b/TODO
index 6ca42ef..378717d 100644
--- a/TODO
+++ b/TODO
@@ -56,3 +56,8 @@
 xargs could use a -l option
 
 ------------------------------------------------------------------
+
+libbb/unzip.c and archival/gzip.c have common constant static arrays and
+code for initializing the CRC array. Both use CRC-32 and could use
+common code for CRC calculation. Within archival/gzip.c, the CRC
+array should be malloc-ed as it is in libbb/unzip.c .