diff --git a/requirements.txt b/requirements.txt
index 0eb6260..bbd45ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,5 @@
+# python 3.6.8
+
 flask==1.0.2
 pyyaml==3.13
 pillow==5.3.0