TODO | 3 +++

diff --git a/TODO b/TODO
index 2c525615a259be8bd2e4c36cecec4d4b2b32a535..93054bb3129b502abad1b77e315db6c761016450 100644
--- a/TODO
+++ b/TODO
@@ -112,3 +112,6 @@   bumping into /proc/sys/fs/pipe-user-pages-* limits
 
 * make "git cat-file --batch" detect unlinked packfiles so we don't
   have to restart processes (very long-term)
+
+* support searching based on `git-patch-id --stable` to improve
+  bidirectional mapping of commits <=> emails