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diff --git a/doc/gpg-card.texi b/doc/gpg-card.texi
index be19704cc..60107176b 100644
--- a/doc/gpg-card.texi
+++ b/doc/gpg-card.texi
@@ -125,6 +125,16 @@ Specify a non-default gpg binary to be used by certain commands.
@opindex gpgsm-program
Specify a non-default gpgsm binary to be used by certain commands.
+@item --chuid @var{uid}
+@opindex chuid
+Change the current user to @var{uid} which may either be a number or a
+name. This can be used from the root account to run gpg-card for
+another user. If @var{uid} is not the current UID a standard PATH is
+set and the envvar GNUPGHOME is unset. To override the latter the
+option @option{--homedir} can be used. This option has only an effect
+when used on the command line. This option has currently no effect at
+all on Windows.
+
@end table
@mansect notes (OpenPGP)