diff --git a/doc/vimwiki.txt b/doc/vimwiki.txt
index 4f935e5..457b1f3 100644
--- a/doc/vimwiki.txt
+++ b/doc/vimwiki.txt
@@ -880,6 +880,12 @@ is decorated: >
 Furthermore, there are a number of words which are highlighted extra flashy:
 TODO, DONE, STARTED, FIXME, FIXED, XXX.
 
+When rendered as HTML, code blocks containing only a hash prefixed 6 digit hex
+number will be colored as themselves.  For example >
+ `#ffe119`
+Becomes >
+ <code style='background-color:#ffe119;color:black;'>#ffe119</code>
+
 ------------------------------------------------------------------------------
 5.2. Links                                              *vimwiki-syntax-links*