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-rw-r--r--runtime/doc/options.txt2
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diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index e63bcdb73..a80c4c8a9 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -4201,6 +4201,8 @@ A jump table for the options with a short description can be found at |Q_op|.
'key' string (default "")
local to buffer
{not in Vi}
+ {only available when compiled with the |+cryptv|
+ feature}
The key that is used for encrypting and decrypting the current buffer.
See |encryption| and 'cryptmethod'.
Careful: Do not set the key value by hand, someone might see the typed