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diff --git a/man/crypttab.xml b/man/crypttab.xml
index 2fa8e8940..8711272a8 100644
--- a/man/crypttab.xml
+++ b/man/crypttab.xml
@@ -130,6 +130,18 @@
                         </varlistentry>
 
 
+                        <varlistentry>
+                                <term><varname>keyfile-size=</varname></term>
+
+                                <listitem><para>Specifies the maximum number
+                                of bytes to read from the keyfile; see
+                                <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+                                for possible values and the default
+                                value of this option. This option is ignored
+                                in plain encryption mode, as the keyfile-size is then given by the key size.</para></listitem>
+                        </varlistentry>
+
+
                         <varlistentry>
                                 <term><varname>keyfile-offset=</varname></term>