diff --git a/subjects/cybersecurity/hole-in-bin/README.md b/subjects/cybersecurity/hole-in-bin/README.md
index f1675e14b..cf726b8a6 100644
--- a/subjects/cybersecurity/hole-in-bin/README.md
+++ b/subjects/cybersecurity/hole-in-bin/README.md
@@ -43,3 +43,4 @@ Files that must be inside your repository:
 - All tools you use, and any scripts you write.
 
 > It's forbidden to use external scripts, in the audit you will be asked different questions about the concepts and the practices of this project, prepare yourself!
+> It's is forbidden to use `strings` command.