diff --git a/autoload/limelight.vim b/autoload/limelight.vim
index d447950..d59968c 100644
--- a/autoload/limelight.vim
+++ b/autoload/limelight.vim
@@ -32,6 +32,11 @@ set cpo&vim
 let s:default_coeff = str2float('0.5')
 let s:invalid_coefficient = 'Invalid coefficient. Expected: 0.0 ~ 1.0'
 
+function! s:nvim_unsupported()
+  let var = 'g:limelight_conceal_guifg'
+  return 'Neovim with true colors is not yet supported. Please set '.var
+endfunction
+
 function! s:unsupported()
   let var = 'g:limelight_conceal_'.(has('gui_running') ? 'gui' : 'cterm').'fg'
 
@@ -144,6 +149,8 @@ function! s:dim(coeff)
       let dim = g:limelight_conceal_guifg
     elseif empty(fg) || empty(bg)
       throw s:unsupported()
+    elseif has('nvim')
+      throw s:nvim_unsupported()
     else
       let coeff = s:coeff(a:coeff)
       let fg_rgb = s:hex2rgb(fg)