diff --git a/docs/source/getting-started/security-basics.rst b/docs/source/getting-started/security-basics.rst
index 1a79f2e6..5da0a668 100644
--- a/docs/source/getting-started/security-basics.rst
+++ b/docs/source/getting-started/security-basics.rst
@@ -86,9 +86,13 @@ Proxy authentication token
 --------------------------
 
 The Hub authenticates its requests to the Proxy using a secret token that
-the Hub and Proxy agree upon. The value of this token should be a random
-string (for example, generated by ``openssl rand -hex 32``). You can store
-it in the configuration file or an environment variable
+the Hub and Proxy agree upon. Note that this applies to the default
+``ConfigurableHTTPProxy`` implementation. Not all proxy implementations
+use an auth token.
+
+The value of this token should be a random string (for example, generated by
+``openssl rand -hex 32``). You can store it in the configuration file or an
+environment variable
 
 Generating and storing token in the configuration file
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~