diff --git a/src/main/webapp/static/themes/themes.README b/src/main/webapp/static/themes/themes.README
index 296f11aea62ca8817382d7461065f4329b2817a3..c3dc7547c7ff2ca22faf1b04e2319163c5efb369 100644
--- a/src/main/webapp/static/themes/themes.README
+++ b/src/main/webapp/static/themes/themes.README
@@ -109,6 +109,9 @@ cd openolat/src/main/webapp/static/themes/
 ./compiletheme.sh mytheme
 
 If you don't have SASS installed, see "Installing SASS below"
+For IE compatibility you need node-module bless in specific version 3.0.3:
+install with: 
+# npm install bless@3.0.3 -g
 
 Testing a custom theme
 ======================