Crypt the swapfile.
diff --git a/runtime/doc/recover.txt b/runtime/doc/recover.txt
index fd960eb..f088c08 100644
--- a/runtime/doc/recover.txt
+++ b/runtime/doc/recover.txt
@@ -188,4 +188,43 @@
{Vi: recovers in another way and sends mail if there is something to recover}
+
+ENCRYPTION AND THE SWAP FILE *:recover-crypt*
+
+When the text file is encrypted the swap file is encrypted as well. This
+makes recovery a bit more complicated. When recovering from a swap file and
+encryption has been used, you will be asked to enter one or two crypt keys.
+
+If the text file does not exist you will only be asked to enter the crypt key
+for the swap file.
+
+If the text file does exist, it may be encrypted in a different way than the
+swap file. You will be asked for the crypt key twice:
+
+ Need encryption key for "/tmp/tt" ~
+ Enter encryption key: ****** ~
+ "/tmp/tt" [crypted] 23200L, 522129C ~
+ Using swap file "/tmp/.tt.swp" ~
+ Original file "/tmp/tt" ~
+ Swap file is encrypted: "/tmp/.tt.swp" ~
+ If you entered a new crypt key but did not write the text file, ~
+ enter the new crypt key. ~
+ If you wrote the text file after changing the crypt key press enter ~
+ to use the same key for text file and swap file ~
+ Enter encryption key: ~
+
+You can be in one of these two situations:
+
+1. The encryption key was not changed, or after changing the key the text file
+ was written. You will be prompted for the crypt key twice. The second
+ time you can simply press Enter. That means the same key is used for the
+ text file and the swap file.
+2. You entered a new encryption key, but did not save the text file. Vim will
+ then use the new key for the swap file, and the text file will still be
+ encrypted with the old key. At the second prompt enter the new key.
+
+Note that after recovery the key of the swap file will be used for the text
+file. Thus if you write the text file, you need to use that new key.
+
+
vim:tw=78:ts=8:ft=help:norl: