diff --git a/subjects/0-shell/README.md b/subjects/0-shell/README.md
index f8aa20321..af5e4c08e 100644
--- a/subjects/0-shell/README.md
+++ b/subjects/0-shell/README.md
@@ -27,6 +27,9 @@ For this project you will only have to create a simple `Unix shell` where you ca
   - mv
   - mkdir
   - exit
+
+> The commands need to be implemented from scratch. It is not allowed to have a Shell call that execute the required commands.
+
 - You must manage the program interruption `Ctrl + D`.
 - The project has to be written in a compiled language (like C, Rust, Go or other), **interpreted languages (like Perl and others) are not allowed**.
 - The code must respect the [good practices](https://public.01-edu.org/subjects/good-practices/)
diff --git a/subjects/0-shell/audit/README.md b/subjects/0-shell/audit/README.md
index 310446576..36dbc12e7 100644
--- a/subjects/0-shell/audit/README.md
+++ b/subjects/0-shell/audit/README.md
@@ -2,6 +2,8 @@
 
 ###### Was the project written in a compiled programming language?
 
+###### Are the commands mentioned in the subject implemented from scratch, without calling any equivalent shell implementation?
+
 #### Functional
 
 ##### Open a terminal and run the project.