diff --git a/README.md b/README.md
index 60776b30..4815459b 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,6 @@ Pure written in bash, no dependencies to python , acme-tiny or LetsEncrypt offic
 
 Just one script, to issue, renew your certificates automatically.
 
-This is a shell version from https://github.com/diafygi/acme-tiny, but without any dependencies.
-
 Probably it's the smallest&easiest&smartest shell script to automatically  issue&renew the free certificates from LetsEncrypt.
 
 
@@ -111,6 +109,13 @@ Speak ACME language with bash directly to Let's encrypt.
 TODO:
 
 
+#Acknowledgment
+1. Acme-tiny: https://github.com/diafygi/acme-tiny
+2. ACME protocol: https://github.com/ietf-wg-acme/acme
+3. letsencrypt: https://github.com/letsencrypt/letsencrypt
+
+
+
 #License & Other
 
 License is GPLv3