diff --git a/autoload/vimtex/complete.vim b/autoload/vimtex/complete.vim
index f98c568..ae5a17a 100644
--- a/autoload/vimtex/complete.vim
+++ b/autoload/vimtex/complete.vim
@@ -65,6 +65,7 @@ function! vimtex#complete#omnifunc(findstart, base) " {{{1
         return -2
       endif
     endfor
+    return -3
   else
     "
     " Second call:  Find list of matches
diff --git a/doc/vimtex.txt b/doc/vimtex.txt
index 5213818..784868b 100644
--- a/doc/vimtex.txt
+++ b/doc/vimtex.txt
@@ -881,24 +881,13 @@ It is described as:
 > Vim's omnicomplete system to provide semantic completions for many other
 > languages (Ruby, PHP etc.).
 
-To enable automatic completion with YouCompleteMe, it has to be explicitely
-enabled for the tex filetype.  For tex files, it is also a good idea to disable
-the identifier based completion and rely only on semantic completion, which
-will use the 'omnifunc' set by |vimtex|.  Then the same patterns as above can
-be used to trigger the semantic completion. >
+To enable automatic completion with |youcompleteme|, use the following options:
 
-  " Enable YCM for tex files
-  let g:ycm_filetype_whitelist.tex = 1
-
-  " Disable identifier based completion for tex files
-  autocmd FileType tex let g:ycm_min_num_of_chars_for_completion = 99
-
-  " Set patterns to trigger semantic completion
   if !exists('g:ycm_semantic_triggers')
     let g:ycm_semantic_triggers = {}
   endif
   let g:ycm_semantic_triggers.tex = [
-        \ '\v\\\a*(ref|cite)\a*([^]]*\])?\{([^}]*,)*[^}]*'
+        \ 're!\\[A-Za-z]*(ref|cite)[A-Za-z]*([^]]*])?{([^}]*, ?)*'
         \ ]
 
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