man: document that [Install] has no effect in unit file .d/*.conf drop-ins

Fixes: #1774
Fixes: #1090

1 files changed, 15 insertions, 21 deletions

diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index 04c4515cd9..16aded89d1 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -178,18 +178,14 @@
     directory suffix is <filename>.requires/</filename> in this
     case.</para>
 
-    <para>Along with a unit file <filename>foo.service</filename>, a
-    directory <filename>foo.service.d/</filename> may exist. All files
-    with the suffix <literal>.conf</literal> from this directory will
-    be parsed after the file itself is parsed. This is useful to alter
-    or add configuration settings to a unit, without having to modify
-    their unit files. Make sure that the file that is included has the
-    appropriate section headers before any directive. Note that, for
-    instanced units, this logic will first look for the instance
-    <literal>.d/</literal> subdirectory and read its
-    <literal>.conf</literal> files, followed by the template
-    <literal>.d/</literal> subdirectory and reads its
-    <literal>.conf</literal> files.</para>
+    <para>Along with a unit file <filename>foo.service</filename>, a "drop-in" directory
+    <filename>foo.service.d/</filename> may exist. All files with the suffix <literal>.conf</literal> from this
+    directory will be parsed after the file itself is parsed. This is useful to alter or add configuration settings to
+    a unit, without having to modify their unit files. Make sure that the file that is included has the appropriate
+    section headers before any directive. Note that for instanced units, this logic will first look for the instance
+    <literal>.d/</literal> subdirectory and read its <literal>.conf</literal> files, followed by the template
+    <literal>.d/</literal> subdirectory and reads its <literal>.conf</literal> files. Also note that settings from the
+    <literal>[Install]</literal> section are not available in drop-in unit files, and have no effect.</para>
 
     <para>In addition to <filename>/etc/systemd/system</filename>,
     the drop-in <literal>.conf</literal> files for system services
@@ -1093,15 +1089,13 @@
   <refsect1>
     <title>[Install] Section Options</title>
 
-    <para>Unit file may include an <literal>[Install]</literal>
-    section, which carries installation information for the unit. This
-    section is not interpreted by
-    <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
-    during runtime. It is used exclusively by the
-    <command>enable</command> and <command>disable</command> commands
-    of the
-    <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
-    tool during installation of a unit:</para>
+    <para>Unit files may include an <literal>[Install]</literal> section, which carries installation information for
+    the unit. This section is not interpreted by
+    <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> during runtime; it is
+    used by the <command>enable</command> and <command>disable</command> commands of the
+    <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> tool during
+    installation of a unit. Note that settings in the <literal>[Install]</literal> section may not appear in
+    <filename>.d/*.conf</filename> unit file drop-ins (see above).</para>
 
     <variablelist class='unit-directives'>
       <varlistentry>