diff --git a/How-to-install.md b/How-to-install.md
index 95dc5de..0669cb5 100644
--- a/How-to-install.md
+++ b/How-to-install.md
@@ -1,4 +1,5 @@
 _`# Update your Linux repo with latest CA bundle and patches from System Update else some issues will occur when generating your free SSL. Once Completed then begin the below procedure`_
+### you can run `yum update ca-certificates` (if centos)
 
 ## 1. Install from web: https://get.acme.sh