diff --git a/README.mkd b/README.mkd
index 79bbcb5..aa1f47a 100644
--- a/README.mkd
+++ b/README.mkd
@@ -5,7 +5,7 @@ A Vim plugin which shows a git diff in the 'gutter' (sign column).  It shows whe
 Features:
 
 * Shows signs for added, modified, and removed lines.
-* Runs the diffs asynchronously in terminal Vim (7.4.1826+), NeoVim and MacVim GUI (7.4.1832+).
+* Runs the diffs asynchronously in terminal Vim/MacVim (7.4.1826+), gVim (7.4.1850+), MacVim GUI (7.4.1832+), and NeoVim.
 * Ensures signs are always as up to date as possible (but without running more than necessary).
 * Quick jumping between blocks of changed lines ("hunks").
 * Stage/undo/preview individual hunks.
diff --git a/autoload/gitgutter/async.vim b/autoload/gitgutter/async.vim
index d08160e..78e725f 100644
--- a/autoload/gitgutter/async.vim
+++ b/autoload/gitgutter/async.vim
@@ -1,12 +1,18 @@
 let s:jobs = {}
 
-" MacVim requires 88f4fe0 but that commit doesn't have a specific patch
-" number. So look for the first subsequent Vim patch.
+" Nvim has always supported async commands.
 "
-" gVim doesn't work properly with channels yet as far as I know.
+" Vim introduced async in 7.4.1826.
+"
+" gVim didn't support aync until 7.4.1850 (though I haven't been able to
+" verify this myself).
+"
+" MacVim-GUI didn't support async until 7.4.1832 (actually commit
+" 88f4fe0 but 7.4.1832 was the first subsequent patch release).
 let s:available = has('nvim') || (
-      \ (has('gui_macvim') && has('patch-7-4-1832')) ||
-      \ (has('patch-7-4-1826') && !has('gui_running'))
+      \ (has('patch-7-4-1826') && !has('gui_running')) ||
+      \ (has('patch-7-4-1850') &&  has('gui_running')) ||
+      \ (has('patch-7-4-1832') &&  has('gui_macvim'))
       \ )
 
 function! gitgutter#async#available()