--- a/docs/changelog	Thu Oct 24 19:30:32 2019 +0200
+++ b/docs/changelog	Thu Oct 24 19:30:45 2019 +0200
@@ -4,11 +4,16 @@
 - bug fixes
 - Editor
   -- extended the spell checking functionality for all text files
+  -- added a context menu to select spell check language
 - MicroPython
   -- added support for PyBoard
 - Previewers
   -- enhanced the Markdown previewer by using the PyMdown extensions, if
      they are available and have been enabled
+  -- enhanced the Markdown previewer to support MathJax, if it has been
+     enabled
+  -- enhanced the Markdown previewer to support Mermaid via the md_mermaid
+     extension, if it is available and has been enabled
 
 Version 19.10:
 - bug fixes