diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 05e0f954c0..cea9384399 100644
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -592,7 +592,8 @@
         of auto-restarts from <varname>RestartSec=</varname> to <varname>RestartMaxDelaySec=</varname>.
         Takes a positive integer or 0 to disable it. Defaults to 0.</para>
 
-        <para>This setting is effective only if <varname>RestartMaxDelaySec=</varname> is also set.</para>
+        <para>This setting is effective only if <varname>RestartMaxDelaySec=</varname> is also set and
+        <varname>RestartSec=</varname> is not zero.</para>
 
         <xi:include href="version-info.xml" xpointer="v254"/></listitem>
       </varlistentry>
@@ -604,7 +605,8 @@
         in the same format as <varname>RestartSec=</varname>, or <literal>infinity</literal>
         to disable the setting. Defaults to <literal>infinity</literal>.</para>
 
-        <para>This setting is effective only if <varname>RestartSteps=</varname> is also set.</para>
+        <para>This setting is effective only if <varname>RestartSteps=</varname> is also set and
+        <varname>RestartSec=</varname> is not zero.</para>
 
         <xi:include href="version-info.xml" xpointer="v254"/></listitem>
       </varlistentry>