diff --git a/prebuild.py b/prebuild.py
index d0bbc75fb7..cc315a49a4 100644
--- a/prebuild.py
+++ b/prebuild.py
@@ -149,6 +149,7 @@ def main():
     if qtInstallPath != '':
         pm.writeVar('QT_CMAKE_PREFIX_PATH', qtInstallPath)
 
+    # Only allow one instance of the program to run at a time
     with hifi_singleton.Singleton(pm.lockFile) as lock:
 
         with timer('Bootstraping'):