diff --git a/blog/ssl_client_certificate_management_at_application_level/pem_creation.sh b/blog/ssl_client_certificate_management_at_application_level/pem_creation.sh
index 82a185b..c4f022b 100644
--- a/blog/ssl_client_certificate_management_at_application_level/pem_creation.sh
+++ b/blog/ssl_client_certificate_management_at_application_level/pem_creation.sh
@@ -1,3 +1,8 @@
+# server PEM file creation (order matters)
 cat server.crt >  server.pem
 cat server.key >> server.pem
 
+# certificate authority concatenation (order doesn't matters)
+cat ca.crt > ca.pem
+cat ca2.crt >> ca.pem
+