diff --git a/README.md b/README.md
index 20104725..0af1c8cc 100644
--- a/README.md
+++ b/README.md
@@ -167,7 +167,8 @@ Use the following steps to prepare your workflow for running on your EC2 self-ho
 1. Create a new VPC and a new subnet in it.
    Or use the existing VPC and subnet.
 2. Create a new security group for the runners in the VPC.
-   Only the outbound traffic on port 443 should be allowed for pulling jobs from GitHub.
+   The outbound traffic on port 443 should be allowed for pulling jobs from GitHub. 
+   You may need to enable additional outbound traffic depends on the tools you're using. 
    No inbound traffic is required.
 
 **5. Configure the GitHub workflow**