diff --git a/tfglobals.py b/tfglobals.py
index ded3bb1..32282b5 100644
--- a/tfglobals.py
+++ b/tfglobals.py
@@ -1,3 +1,10 @@
 from time import time
 
+"""
+This file is for shared global variables. They only stay during runtime.
+
+For reference: 
+https://stackoverflow.com/questions/15959534/visibility-of-global-variables-in-imported-modules
+"""
+
 last_twitter_request = time()