diff --git a/mwiki/extensions/README-ooo-wiki.txt b/mwiki/extensions/README-ooo-wiki.txt
index 9f9e656..6c7c14a 100644
--- a/mwiki/extensions/README-ooo-wiki.txt
+++ b/mwiki/extensions/README-ooo-wiki.txt
@@ -6,3 +6,7 @@
 
 [1] https://www.mediawiki.org/wiki/Special:ExtensionDistributor
 
+== Using tags for syntax coloring: ==
+mwiki uses Syntaxhighlight extension for coloring of source code.
+In older versions (before MediaWiki 1.16), the extension used the tag <source>. 
+This is still supported, but is deprecated. <syntaxhighlight> should be used instead.