diff --git a/journal/journal.md b/journal/journal.md
index 2768585dbc2f62a18cc7a02dac6d5629b0c6c355..182a27a3b0c136c9a6e64bd7da6429106dd8e40c 100644
--- a/journal/journal.md
+++ b/journal/journal.md
@@ -10,6 +10,7 @@ markdownguide.org
 - look into org-mode for keeping notes during the PhD
 - constant writing down of progress, problems, solutions
     - helpful for supervisor meetings
+- never edit old journal entries! 
 
 ### Module 3