diff --git a/autoload/vimwiki/u.vim b/autoload/vimwiki/u.vim
index 3505554..71e4fc4 100644
--- a/autoload/vimwiki/u.vim
+++ b/autoload/vimwiki/u.vim
@@ -359,7 +359,8 @@ endfunction
 
 function! vimwiki#u#hi_tag(tag_pre, tag_post, syntax_group, contains, ...) abort
   " Helper: Create highlight region between two tags
-  " :param: tag <string> example '<b>'
+  " :param: tag_pre <string>: opening tag example '<b>'
+  " :param: tag_post <string>: closing tag example '</b>'
   " :param: syntax_group <string> example: VimwikiBold
   " :param: contains <string> coma separated and prefixed, default VimwikiHTMLTag
   " :param: (1) <boolean> is contained
diff --git a/syntax/vimwiki.vim b/syntax/vimwiki.vim
index 259f49b..ded7e62 100644
--- a/syntax/vimwiki.vim
+++ b/syntax/vimwiki.vim
@@ -328,6 +328,13 @@ for [color_key, color_value] in items(color_dic)
   execute cmd
 endfor
 
+" Html mark tag, feature request in issue #1261
+let cmd = 'syntax region VimwikiMarkTag matchgroup=VimwikiDelimiterColor'
+      \ . ' start=/<mark>/'
+      \ . ' end=+</mark>+'
+      \ . ' ' . b:vimwiki_syntax_concealends
+execute cmd
+
 
 " Comment: home made
 execute 'syntax match VimwikiComment /'.vimwiki#vars#get_syntaxlocal('comment_regex').
@@ -417,6 +424,8 @@ hi def link VimwikiUnderlineItalicBold VimwikiBoldItalicUnderline
 hi def link VimwikiCode PreProc
 hi def link VimwikiCodeT VimwikiCode
 
+" Mark
+hi def VimwikiMarkTag term=bold ctermbg=yellow ctermfg=black guibg=yellow guifg=black
 hi def link VimwikiPre PreProc
 hi def link VimwikiPreT VimwikiPre
 hi def link VimwikiPreDelim VimwikiPre
diff --git a/test/issue_1261_mark_tag.vader b/test/issue_1261_mark_tag.vader
new file mode 100644
index 0000000..f7e33b5
--- /dev/null
+++ b/test/issue_1261_mark_tag.vader
@@ -0,0 +1,35 @@
+# Issue: #1261: Feature: Support for <mark> in Markdown
+
+
+Given vimwiki (Single line mark):
+  <mark>Single line</mark>
+  01234567890
+
+
+Execute (Set syntax markdown):
+  call SetSyntax('markdown')
+
+
+Execute (Assert all is yaml except after the closing ---):
+  AssertEqual 'VimwikiMarkTag1', GetSyntaxStack(1, 7)[0] . 1
+  AssertEqual '02', len(GetSyntaxStack(2, 7)) . 2
+
+
+Given vimwiki (Multiple line mark):
+  <mark>Start
+  Multiple
+  Line
+  end</mark>
+  01234567890
+
+
+Execute (Set syntax markdown):
+  call SetSyntax('markdown')
+
+
+Execute (Assert all is yaml except after the closing ---):
+  AssertEqual 'VimwikiMarkTag1', GetSyntaxStack(1, 7)[0] . 1
+  AssertEqual 'VimwikiMarkTag2', GetSyntaxStack(2, 2)[0] . 2
+  AssertEqual 'VimwikiMarkTag3', GetSyntaxStack(3, 2)[0] . 3
+  AssertEqual 'VimwikiMarkTag4', GetSyntaxStack(4, 2)[0] . 4
+  AssertEqual '05', len(GetSyntaxStack(5, 7)) . 5