diff --git a/README.md b/README.md
index ef4b619..6fc3fca 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,14 @@ https://opto.ca/health-library/the-20-20-20-rule
 
 https://www.healthline.com/health/eye-health/20-20-20-rule#definition
 
+Optional Step : 
+
+In order to not to get error while installing application you have to export root CA file.
+
+https://knowledge.digicert.com/solution/SO13755.html 
+
+Follow the above steps with "Sridharan.cer" file.
+
 
 This script is designed in such a way to follow 20-20-20 rule.
 
@@ -13,4 +21,4 @@ Run "ProtectYourEyes.exe" when you are start working. This will alert by playing
 
 Time is configurable meaning you can set the default time for yourself. (Ex: 15 minutes)
 
-When you are done just close this application. 
+When you are done just close this application.