diff --git a/builder/main.py b/builder/main.py
index 1c2b228..8a15a49 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -205,6 +205,7 @@ env.Append(
     )
 )
 
+# store function to get infno about filesystems for builder scripts.
 env["fetch_fs_size"] = fetch_fs_size
 
 #