Update runtime files.
diff --git a/runtime/doc/tabpage.txt b/runtime/doc/tabpage.txt
index a80d7c3..1d3365c 100644
--- a/runtime/doc/tabpage.txt
+++ b/runtime/doc/tabpage.txt
@@ -241,8 +241,10 @@
:tabm[ove] [N] *:tabm* *:tabmove*
:[N]tabm[ove]
Move the current tab page to after tab page N. Use zero to
- make the current tab page the first one. Without N the tab
- page is made the last one. >
+ make the current tab page the first one. N is counted before
+ the move, thus if the second tab is the current one,
+ `:tabmove 1`` and `:tabmove 2` have no effect.
+ Without N the tab page is made the last one. >
:.tabmove " do nothing
:-tabmove " move the tab page to the left
:+tabmove " move the tab page to the right