diff --git a/TODO b/TODO
index e6ad6d39..14cf683d 100644
--- a/TODO
+++ b/TODO
@@ -36,3 +36,12 @@ verbose mode, which usage for the library log callback, pmo_debug, ...)
 
 - add HTTP support for .lastupdate files
 
+
+ADDITIONAL IDEAS FOR PERFORMANCE IMPROVEMENT
+============================================
+
+- idea from Christian Hamar: have a /var/lib/pacman/{repo}/.cache file
+that basically contains the output of `ls -1 /var/lib/pacman/{repo}`.  This
+cache file could be used in -Q and -Si/s operations to speed up package
+listings.
+