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diff --git a/README.md b/README.md
index e2e925d..bf6a969 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@ documentation and source code for departmental mqtt server
 
 hosted at https://mosquitto.chem.wisc.edu
 
+## operating system
+
+ubuntu 20.04
+
 ## mosquitto
 
 https://mosquitto.org/