diff --git a/after/ftplugin/markdown.vim b/after/ftplugin/markdown.vim
index f9da4f2..33b5f1c 100644
--- a/after/ftplugin/markdown.vim
+++ b/after/ftplugin/markdown.vim
@@ -1,7 +1,8 @@
 set concealcursor=c
 set synmaxcol=3000  " For long Chinese paragraphs
 
+" Fix minor issue with footnote, see https://github.com/vim-pandoc/vim-markdownfootnotes/issues/22
 if exists(':FootnoteNumber')
-  nnoremap <buffer> <Plug>AddVimFootnote :<c-u>call markdownfootnotes#VimFootnotes('i')<CR>
-  inoremap <buffer> <Plug>AddVimFootnote <C-O>:<c-u>call markdownfootnotes#VimFootnotes('i')<CR>
+  nnoremap <buffer> <Plug>AddVimFootnote :<C-U>call markdownfootnotes#VimFootnotes('i')<CR>
+  inoremap <buffer> <Plug>AddVimFootnote <C-O>:<C-U>call markdownfootnotes#VimFootnotes('i')<CR>
 endif