diff --git a/doc/TODO b/doc/TODO
index 883689c01ef..5b67873b49d 100644
--- a/doc/TODO
+++ b/doc/TODO
@@ -12,6 +12,7 @@ xbps-src:
 
 xbps-cmpver:
  * It fails in some cases: foo-2.0 vs foo-1.99 and foo-2a vs foo-2b.
+   Another case that fails: 1.7.0 vs 1.6.[56789].
 
 Packages:
  * fix mpfr hardcoded rpath for gmp.