--- a/.vimrc	Wed Jun 17 14:17:08 2020 +0800
+++ b/.vimrc	Wed Jun 17 14:19:32 2020 +0800
@@ -27,6 +27,7 @@
 set nowrap           " don't automatically wrap on load
 set textwidth=79     " width of document (used by gd)
 set formatoptions-=t " don't automatically wrap text when typing
+set formatoptions+=j " remove comment leader when joining lines
 
 set tabstop=8
 set softtabstop=4