diff --git a/TODO.txt b/TODO.txt
index ea4a8b38559f20341b472f5e894761510921523f..43c0d804e7f88ebbe699bdf54a10bd837d81829d 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,5 +1,7 @@
 This should move into GitLab issues at some point.
 
+- Some _combinations_ of tests generate ResourceWarnings; figure out why; fix or suppress
+
 - Add missing tests
  	- DownloadStatistics.__add__ doctest and unittest
  	- human_bytes doctest and unittest