From 25c525dcb3bde2717f538ddacdc8a6f378d71a43 Mon Sep 17 00:00:00 2001
From: Christopher Fremond <34804391+Frenchris@users.noreply.github.com>
Date: Thu, 16 Jul 2020 12:56:34 +0100
Subject: [PATCH] Update README.md

---
 subjects/isprime/README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/subjects/isprime/README.md b/subjects/isprime/README.md
index 5da1d49f2..a97c42653 100644
--- a/subjects/isprime/README.md
+++ b/subjects/isprime/README.md
@@ -6,6 +6,8 @@ Write a function that returns `true` if the `int` passed as parameter is a prime
 
 The function must be optimized in order to avoid time-outs with the tester.
 
+(We consider that only positive numbers can be prime numbers)
+
 ### Expected function
 
 ```go