diff --git a/runtime/optwin.vim b/runtime/optwin.vim
index c27fbd5..404cf89 100644
--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -722,6 +722,8 @@
 call <SID>Header("editing text")
 call append("$", "undolevels\tmaximum number of changes that can be undone")
 call append("$", " \tset ul=" . &ul)
+call append("$", "undoreload\tmaximum number lines to save for undo on a buffer reload")
+call append("$", " \tset ur=" . &ur)
 call append("$", "modified\tchanges have been made and not written to a file")
 call append("$", "\t(local to buffer)")
 call <SID>BinOptionL("mod")