diff --git a/docs/simplesamlphp-install.md b/docs/simplesamlphp-install.md
index c2760a1d3ee3201a1316c0f6fce2f41700928b6c..955b1f99e708b592c2cab39b27a9c76dfd45600b 100644
--- a/docs/simplesamlphp-install.md
+++ b/docs/simplesamlphp-install.md
@@ -367,6 +367,15 @@ At the bottom of the installation page there are some green lights. SimpleSAMLph
 required and recommended prerequisites are met. If any of the lights are red, you may have to install some PHP 
 extensions or external PHP packages (e.g. you need the PHP LDAP extension to use the LDAP authentication module).
 
+## Building assets
+
+Run the following commands to build the default theme.
+
+```
+npm install
+npm run build
+```
+
 ## Next steps
 
 You have now successfully installed SimpleSAMLphp, and the next steps depend on whether you want to setup a Service