diff --git a/.vim/vimrc b/.vim/vimrc
index dffe659..cd37e5f 100644
--- a/.vim/vimrc
+++ b/.vim/vimrc
@@ -1262,6 +1262,12 @@ hi! link texMathZoneX texMathZone
 hi! link texMathZoneXX texMathZone
 hi! link texMathZoneEnsured texMathZone
 
+
+" keep buffer contents in memory (e.g. undo history doesn't go away if change
+" buffers and not saving undo history to disk)
+" enable hidden buffers
+set hidden
+
 set conceallevel=0            " for jsons
 set ttymouse=sgr              " falls back to xterm,xterm2
 " temporarily set ttymouse to xterm mode, setting notballoonevalterm did not