diff --git a/README.md b/README.md
index 9428cc6..a5df442 100644
--- a/README.md
+++ b/README.md
@@ -8,13 +8,33 @@ Bash scripts to check whether a site is available or not, and whether the certif
 
 Usage: urls_check.sh
 
+1. Check whether the certificate is valid or not, using <u>showcert</u> (pip install showcert) if available, else use <u>openssl.</u>
+2. Check if the url is up or down with it's http_code.
+
+Required the <u>urls_list.txt</u> file that contain a list of domains:
+
+```bash
+#https://notif.domain.com
+#https://ntfy.domain.com
+https://paperlessngx.domain.com
+https://pastebin.domain.com
+
+# comment line to disable checking this url
+```
+
+Required the <u>status.txt</u> file to give information about the http code returned.
+
+```bash
+302;Found;https://developer.mozilla.org/fr/docs/Web/HTTP/Status/302
+```
+
 
 
 #### 2) validity.sh
 
 Usage: ./validity.sh
 
-Check whether the certificate is valid or not.
+Check whether the certificate is valid or not, using <u>showcert</u> (pip install showcert) if available, else use <u>openssl.</u>
 
 Required the <u>validity_domains.txt</u> file that contain a list of domains:
 
@@ -23,3 +43,4 @@ domain1.com
 domain2.fr
 ```
 
+or edit the hosts() array in source code.