diff --git a/README.md b/README.md
index 9095dbb..ae6bcdc 100644
--- a/README.md
+++ b/README.md
@@ -432,7 +432,9 @@ Run `terminus list secret` for a complete list of available commands. Use termin
 
 ## Rate Limiting
 
-The service supports up to 3 requests per second per user. If you hit that limit, the API will return a `429` error code and the plugin will throw an error.
+The service supports up to 3 requests per second per user through Terminus. If you hit that limit, the API will return a `429` error code and the plugin will throw an error.
+
+The PHP SDK and `get_pantheon_secret()` function are not affected by this rate limiting.
 
 ## Use Secrets with Integrated Composer