diff --git a/README.md b/README.md
index 6ef8d9c..941d2d2 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # wnow
 wnow simple Python command line moving digital world clock
+
+works on Windows, Linux, BSD and macOS
+you may need to make some small changes depending on your system:
+use backports.zoneinfo if zoneinfo is not available
+use either of COLORS or COLOR_PAIRS depending on your OS (COLOR_PAIRS for Windows)
+future implementations shall make these changes automatically
+