diff --git a/app/gateway/sandboxing.md b/app/gateway/sandboxing.md
index 877d72f0654..d7e7fbbae97 100644
--- a/app/gateway/sandboxing.md
+++ b/app/gateway/sandboxing.md
@@ -151,6 +151,7 @@ kong.client.get_jwt_token_header
 kong.client.get_jwt_token_payload
 kong.client.get_identity_realm_source
 kong.client.set_identity_realm_source
+kong.client.get_principal
 ```
 
 #### Kong Cluster PDK