TODO: forbid filtering stdin to stdout

diff --git a/TODO b/TODO
index 93527c1c66437eabfa54424f0e5877fd6416db61..a7a1dfb02ba17b67c7292f3028b3b7e28a349214 100644 (file)
--- a/TODO
+++ b/TODO
@@ -1,3 +1,5 @@
 pip.
 
 Upgrade docbook-xsl.
+
+Forbid filtering stdin to stdout - require one of them to be a file.