diff --git a/mod.config b/mod.config
index 7eda3da..6d8effc 100644
--- a/mod.config
+++ b/mod.config
@@ -80,6 +80,7 @@ AUTOMATIC_ENGINE_MANAGEMENT="True"
 AUTOMATIC_ENGINE_SOURCE="https://github.com/OpenRA/OpenRA/archive/${ENGINE_VERSION}.zip"
 
 # Temporary file/directory names used by automatic engine management.
+# Paths outside the SDK directory are not officially supported.
 AUTOMATIC_ENGINE_EXTRACT_DIRECTORY="./engine_temp"
 AUTOMATIC_ENGINE_TEMP_ARCHIVE_NAME="engine.zip"
 ENGINE_DIRECTORY="./engine"