diff --git a/man/crypttab.xml b/man/crypttab.xml
index 2a839944dc..acc702961d 100644
--- a/man/crypttab.xml
+++ b/man/crypttab.xml
@@ -220,7 +220,8 @@
                                 for querying for a password. If no
                                 unit is specified seconds is used.
                                 Supported units are s, ms,
-                                us, min, h, d.</para></listitem>
+                                us, min, h, d. A timeout of 0 waits
+                                indefinitely.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
diff --git a/man/systemd-ask-password.xml b/man/systemd-ask-password.xml
index 7b0b9ab809..563f9d5d61 100644
--- a/man/systemd-ask-password.xml
+++ b/man/systemd-ask-password.xml
@@ -129,7 +129,8 @@
 
                                 <listitem><para>Specify the query
                                 timeout in seconds. Defaults to
-                                90s.</para></listitem>
+                                90s. A timeout of 0 waits indefinitely.
+                                </para></listitem>
                         </varlistentry>
 
                         <varlistentry>