diff --git a/.gitmodules b/.gitmodules
index 59ea975..e8d9d4f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -25,3 +25,6 @@
 [submodule "bundle/session"]
 	path = bundle/session
 	url = git://github.com/vim-scripts/session.vim--Odding.git
+[submodule "bundle/fontsize"]
+	path = bundle/fontsize
+	url = git://github.com/vim-scripts/fontsize.vim.git
diff --git a/bundle/fontsize b/bundle/fontsize
new file mode 160000
index 0000000..3b114e2
--- /dev/null
+++ b/bundle/fontsize
@@ -0,0 +1 @@
+Subproject commit 3b114e2935f60ba5711061662f2f97e9075ec948
diff --git a/vimrc b/vimrc
index 13cad06..e1077b9 100644
--- a/vimrc
+++ b/vimrc
@@ -24,6 +24,11 @@ if has("gui_running")
   set go=aegitt
   set co=115
   set lines=40
+  " Map Alt-keys for fontsize
+  nmap <M-+> <Plug>FontsizeInc
+  nmap <M-=> <Plug>FontsizeInc
+  nmap <M--> <Plug>FontsizeDec
+  nmap <M-0> <Plug>FontsizeDefault
 endif
 
 " Settings for tpope's surround plugin