Update security_checker.rst

Author: shreypuranik

security/security_checker.rst

@@ -23,7 +23,9 @@ FriendsOfPHP organization.
     The ``security:check`` command terminates with a non-zero exit code if
     any of your dependencies is affected by a known security vulnerability.
     This allows you to add it to your project build process and your continuous
-    integration workflows.
+    integration workflows. Depending on the continious integration workflow, a
+    non-zero exit code could also result in the build process terminating in the 
+    event of vulnerabilities being highlighted. 
 
 .. note::