--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1371,10 +1371,17 @@ the file is encrypted.
 To disable the encryption, reset the 'key' option to an empty value: >
 	:set key=
 
-You can use the 'cryptmethod' option to select the type of encryption.  Do
-this before writing the file.  When reading an encrypted file it will be set
-automatically to the method used when that file was written.  You can change
-'cryptmethod' before writing that file to change the method.
+You can use the 'cryptmethod' option to select the type of encryption, use one
+of these two: >
+	:setlocal cm=zip       " weak method, backwards compatible
+	:setlocal cm=blowfish  " strong method
+Do this before writing the file.  When reading an encrypted file it will be
+set automatically to the method used when that file was written.  You can
+change 'cryptmethod' before writing that file to change the method.
+To set the default method, used for new files, use one of these in your
+|vimrc| file: >
+	set cm=zip
+	set cm=blowfish
 
 When writing an undo file, the same key and method will be used for the text
 in the undo file. |persistent-undo|.