diff --git a/README.md b/README.md
index 39dc558..fc4d337 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # xlock screen locker
 
-`xlock` really does nothing, it uses and wraps [`i3lock`]() into [systemd]() to allow a seamless screen lock. You have as a background the screenshot of your current screen, the mouse pointer works, nothing can happen. You just have to type your password, press enter and here you go.
+`xlock` really does nothing, it uses and wraps [`i3lock`](https://github.com/i3/i3lock) into [systemd](https://freedesktop.org/wiki/Software/systemd/) to allow a seamless screen lock. You have as a background the screenshot of your current screen, the mouse pointer works, nothing can happen. You just have to type your password, press enter and here you go.
 
 
 Your friends and coworkers can be attempted, they won't succeed !
@@ -8,6 +8,10 @@ Your friends and coworkers can be attempted, they won't succeed !
 
 ### Installation
 
+Requirements :
+- i3lock
+- [scrot](https://phab.enlightenment.org/diffusion/ESVN/browse/trunk/misc/scrot;35502)
+
 run `./install.sh` ; you need sudo permissions.
 
 ### How to use