diff --git a/config.example.json b/config.example.json
index 40e78d4..d533133 100644
--- a/config.example.json
+++ b/config.example.json
@@ -5,7 +5,9 @@
         "Language whitelist, e.g.",
         "haskell",
         "python",
-        "Change to null to enable all languages"
+        "The language names here are different from the user-facing ones.",
+        "Check the folders in docker/ for the language names.",
+        "Change to null to enable all languages."
     ],
     "memory": "128m",
     "cpus": "0.5",