Fix hang when resizing in diff mode and there are concealed items.
diff --git a/runtime/doc/editing.txt b/runtime/doc/editing.txt
index 4d5b00f..9cbb14f 100644
--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1414,6 +1414,9 @@
 line to "/etc/magic", "/usr/share/misc/magic" or wherever your system has the
 "magic" file: >
      0	string	VimCrypt~	Vim encrypted file
+     >9	string	01	- "zip" cryptmethod
+     >9	string	02	- "blowfish" cryptmethod
+
 
 Notes:
 - Encryption is not possible when doing conversion with 'charconvert'.