diff --git a/CHANGES.rst b/CHANGES.rst
index fb984587ab..02ed3fc12d 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -18,6 +18,9 @@ Incompatibilities:
 
 New:
 
+- Allow to define multiple ``tinymce-content-css`` in theme ``manifest.cfg`` files, seperated by a comma.
+  [thet]
+
 - Update npm package depencies.
   [thet]
 
diff --git a/Products/CMFPlone/patterns/tinymce.py b/Products/CMFPlone/patterns/tinymce.py
index 64e0d9084a..1a05ed31dc 100644
--- a/Products/CMFPlone/patterns/tinymce.py
+++ b/Products/CMFPlone/patterns/tinymce.py
@@ -42,7 +42,10 @@ def get_content_css(self, style_css=''):
         theme = self.get_theme()
         tinymce_content_css = getattr(theme, 'tinymce_content_css', None)
         if tinymce_content_css is not None:
-            files.append(self.nav_root_url + theme.tinymce_content_css)
+            files.extend([
+                self.nav_root_url + _
+                for _ in theme.tinymce_content_css.split(',')
+            ])
 
         return ','.join(files)