diff --git a/README.md b/README.md
index 47a31ce..5546b42 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ services:
 You can use the following optional environment variables to configure/customise Jump...
 
 - `SITENAME` - Custom site name.
+- `SHOWCLOCK: 'true'` - Show/hide the clock.
+- `METRICTEMP: 'true'` - Metric (C) or imperial (F) temperature units.
 - `NOINDEX: 'true'` - Include a robots noindex meta tag in site header
 - `CACHEBYPASS: 'true'` - Bypass all caches, useful for testing changes.
 - `OWMAPIKEY` - An API key for Open Weather Map, LATLONG (below) must also be defined.