man: document that program invocation will fail if the User= does not exist

Fixes: #14565

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 9d98b2b411f87098ff87f96f2bcf1800468faf82..bf17188ed24f6d4f9bf7bc7cbc9b84505972219a 100644 (file)
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -221,12 +221,13 @@
         Linux systems.</para>
 
         <para>When used in conjunction with <varname>DynamicUser=</varname> the user/group name specified is
-        dynamically allocated at the time the service is started, and released at the time the service is stopped —
-        unless it is already allocated statically (see below). If <varname>DynamicUser=</varname> is not used the
-        specified user and group must have been created statically in the user database no later than the moment the
-        service is started, for example using the
-        <citerefentry><refentrytitle>sysusers.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> facility, which
-        is applied at boot or package install time.</para>
+        dynamically allocated at the time the service is started, and released at the time the service is
+        stopped — unless it is already allocated statically (see below). If <varname>DynamicUser=</varname>
+        is not used the specified user and group must have been created statically in the user database no
+        later than the moment the service is started, for example using the
+        <citerefentry><refentrytitle>sysusers.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+        facility, which is applied at boot or package install time. If the user does not exist by then
+        program invocation will fail.</para>
 
         <para>If the <varname>User=</varname> setting is used the supplementary group list is initialized
         from the specified user's default group list, as defined in the system's user and group