From 9f6661b585d3d60f49505b16ffb2b3fe83490ead Mon Sep 17 00:00:00 2001
From: Christopher Fremond <34804391+Frenchris@users.noreply.github.com>
Date: Fri, 25 Oct 2019 05:03:56 +0100
Subject: [PATCH] Update swapbits.en.md

---
 subjects/swapbits.en.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/subjects/swapbits.en.md b/subjects/swapbits.en.md
index d6fb0d026..9c3782a9a 100644
--- a/subjects/swapbits.en.md
+++ b/subjects/swapbits.en.md
@@ -1,5 +1,16 @@
 ## swapbits
 
+##**WARNING! VERY IMPORTANT!**
+
+For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
+
+This means that:
+
+- The package needs to be named `package main`.
+- The submitted code needs one declared function main(```func main()```) even if empty.
+- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
+- Every other rules are obviously the same than for a `program`.
+
 ### Instructions
 
 Write a function that takes a `byte`, swaps its halfs (like the