diff --git a/vim8.md b/vim8.md
index 339d3c3..782cef6 100644
--- a/vim8.md
+++ b/vim8.md
@@ -49,6 +49,7 @@ set tabstop=4 shiftwidth=4 expandtab
 set number numberwidth=4
 set splitbelow
 set encoding=utf-8 fileencoding=utf-8
+set mouse=a
 syntax on
 EOF