diff --git a/src/content/configuration/dev-server.md b/src/content/configuration/dev-server.md
index f9bc091de557..e7e453af3422 100644
--- a/src/content/configuration/dev-server.md
+++ b/src/content/configuration/dev-server.md
@@ -470,7 +470,7 @@ overlay: {
 
 `string`
 
-Path to a SSL pfx file.
+When used via the CLI, a path to an SSL .pfx file. If used in options, it should be the bytestream of the .pfx file.
 
 ```js
 pfx: '/path/to/file.pfx'