diff --git a/autoload/denops/util.vim b/autoload/denops/util.vim
index 9b55fa94..c7c28298 100644
--- a/autoload/denops/util.vim
+++ b/autoload/denops/util.vim
@@ -2,14 +2,15 @@ let s:sep = has('win32') ? '\' : '/'
 let s:root = expand('<sfile>:h:h:h')
 
 function! denops#util#meta() abort
+  let mode = g:denops#_test ? 'test' : g:denops#debug ? 'debug' : 'release'
   if exists('s:meta')
-    return s:meta
+    return extend({'mode': mode}, s:meta, 'keep')
   endif
   let l:host = has('nvim') ? 'nvim' : 'vim'
   let l:version = s:get_host_version()
   let l:platform = has('win32') ? 'windows' : has('mac') ? 'mac' : 'linux'
   let s:meta = {
-        \ 'mode': g:denops#_test ? 'test' : g:denops#debug ? 'debug' : 'release',
+        \ 'mode': mode,
         \ 'host': l:host,
         \ 'version': l:version,
         \ 'platform': l:platform,
diff --git a/doc/denops.txt b/doc/denops.txt
index 28a0a1d5..cc3347f1 100644
--- a/doc/denops.txt
+++ b/doc/denops.txt
@@ -45,6 +45,11 @@ VARIABLE						*denops-variable*
 	Note that the debug mode would affect the performance so disable it
 	unless you are debugging deno plugins.
 
+	WARNING In debug mode, any interactive functions (such as |input()|)
+	does not work properly in Vim prior to 8.2.3081 due to internal
+	workaround implementations. See an issue #93 for details.
+	https://github.com/vim-denops/denops.vim/issues/93
+
 	Default: 0
 
 *g:denops#server#channel#deno*