man: mention that conditions in [Match] section support negation

1 files changed, 20 insertions, 18 deletions

diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index 268ae22d91..4127084703 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -137,53 +137,55 @@
         <varlistentry>
           <term><varname>Host=</varname></term>
           <listitem>
-            <para>Matches against the hostname or machine ID of the
-            host. See <literal>ConditionHost=</literal> in
+            <para>Matches against the hostname or machine ID of the host. See
+            <literal>ConditionHost=</literal> in
             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
-            for details.
+            for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
+            If an empty string is assigned, then previously assigned value is cleared.
             </para>
           </listitem>
         </varlistentry>
         <varlistentry>
           <term><varname>Virtualization=</varname></term>
           <listitem>
-            <para>Checks whether the system is executed in a virtualized
-            environment and optionally test whether it is a specific
-            implementation. See <literal>ConditionVirtualization=</literal> in
+            <para>Checks whether the system is executed in a virtualized environment and optionally test
+            whether it is a specific implementation. See <literal>ConditionVirtualization=</literal> in
             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
-            for details.
+            for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
+            If an empty string is assigned, then previously assigned value is cleared.
             </para>
           </listitem>
         </varlistentry>
         <varlistentry>
           <term><varname>KernelCommandLine=</varname></term>
           <listitem>
-            <para>Checks whether a specific kernel command line option is
-            set (or if prefixed with the exclamation mark unset). See
+            <para>Checks whether a specific kernel command line option is set. See
             <literal>ConditionKernelCommandLine=</literal> in
             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
-            for details.
+            for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
+            If an empty string is assigned, then previously assigned value is cleared.
             </para>
           </listitem>
         </varlistentry>
         <varlistentry>
           <term><varname>KernelVersion=</varname></term>
           <listitem>
-            <para>Checks whether the kernel version (as reported by <command>uname -r</command>) matches a certain
-            expression (or if prefixed with the exclamation mark does not match it). See
-            <literal>ConditionKernelVersion=</literal> in
-            <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
-            details.
+            <para>Checks whether the kernel version (as reported by <command>uname -r</command>) matches a
+            certain expression. See <literal>ConditionKernelVersion=</literal> in
+            <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+            for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
+            If an empty string is assigned, then previously assigned value is cleared.
             </para>
           </listitem>
         </varlistentry>
         <varlistentry>
           <term><varname>Architecture=</varname></term>
           <listitem>
-            <para>Checks whether the system is running on a specific
-            architecture. See <literal>ConditionArchitecture=</literal> in
+            <para>Checks whether the system is running on a specific architecture. See
+            <literal>ConditionArchitecture=</literal> in
             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
-            for details.
+            for details. When prefixed with an exclamation mark (<literal>!</literal>), the result is negated.
+            If an empty string is assigned, then previously assigned value is cleared.
             </para>
           </listitem>
         </varlistentry>