diff --git a/README-4CF4.md b/README-4CF4.md
index a6f46cde..f86b1e09 100644
--- a/README-4CF4.md
+++ b/README-4CF4.md
@@ -5,7 +5,7 @@ Set should be defined in lingua terminator tone letter type id of 72 bit tree sl
 
 Rules:
 
-- filename: 16 words + 4 words extension
+- filename: 16 words + 4 words extension (todo: 15 + 5 is trit alligned)
 - directory: 20 words, max 4 levels
 - one glyph word has one fixed meaning to have hard-coded translations
 - In unicode file paths the "ᣘᖮ" postfix can be used as an marker