diff --git a/TODO b/TODO
index add6e10a..93c5e9ab 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,7 @@
 Possible improvements people could work on:
 
-- [BUGFIX] Accept empty (relative) URIs.
+- [BUGFIX] Accept empty (relative) URIs. Solution: adjust check_syntax()
+  Note: the empty string ('') seems to be already in the cache (?)
 
 - [FEATURE] Assign numbers to warnings and let the user configure which to
   ignore.