diff --git a/README.md b/README.md
index b9b8f371b6c9c7021a05801e0c3b8572979ff899..de06cd08b3e72629700f69ee779ee41903319f86 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,13 @@ There are two scripts for adding data to the database:
 
 where the former uses randomized data, and the latter uses specific data useful in combination with the frontend. See the respective files for how to use them.
 
+## Themes
+
+The application has three different themes: uio, uib and default. The default uses the palette found in Material UI,
+while uio and uib sets a color scheme that matches the institution.
+
+To set the theme used update REACT_APP_THEME in frontend/.env.
+
 ## Static type analysis
 
 Use [mypy](http://mypy-lang.org/) to run static type checks using type hints.