diff --git a/DEPENDENCIES.md b/DEPENDENCIES.md
index c6043d09d049b91cfc0a03560970537feb8bbc06..f3e1d1706dd8dd9bdbdab16377c2c75ed0299f7f 100644
--- a/DEPENDENCIES.md
+++ b/DEPENDENCIES.md
@@ -24,5 +24,12 @@
 * proj4js-2.5.0
 * Proj4Leaflet-1.0.1
 
+## For CKEditor (WYSIWYG editor in edit mode)
+
+* we're using a custom-built ckeditor 31.0.0 from
+  https://ckeditor.com/ckeditor-5/online-builder/ with a customized set of
+  editor plugins. Please refer to the `package.json` within
+  `libs/ckeditor...zip` for a full list of said plugins.
+
 ## For testing
 * qunit-2.9.2