Update runtime files.
diff --git a/runtime/doc/channel.txt b/runtime/doc/channel.txt
index ea0274f..632628a 100644
--- a/runtime/doc/channel.txt
+++ b/runtime/doc/channel.txt
@@ -1,4 +1,4 @@
-*channel.txt* For Vim version 8.1. Last change: 2019 May 05
+*channel.txt* For Vim version 8.1. Last change: 2019 May 12
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -155,7 +155,10 @@
func MyCloseHandler(channel)
< Vim will invoke callbacks that handle data before invoking
close_cb, thus when this function is called no more data will
- be passed to the callbacks.
+ be passed to the callbacks. However, if a callback causes Vim
+ to check for messages, the close_cb may be invoked while still
+ in the callback. The plugin must handle this somehow, it can
+ be useful to know that no more data is coming.
*channel-drop*
"drop" Specifies when to drop messages:
"auto" When there is no callback to handle a message.