Index: head/en_US.ISO8859-1/books/handbook/ports/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/handbook/ports/chapter.xml
+++ head/en_US.ISO8859-1/books/handbook/ports/chapter.xml
@@ -627,12 +627,12 @@
     </sect2>
 
     <sect2 xml:id="pkgng-autoremove">
-      <title>Automatically Removing Leaf Dependencies</title>
+      <title>Automatically Removing Unused Packages</title>
 
       <para>Removing a package may leave behind dependencies which
 	are no longer required.  Unneeded packages that were installed
-	as dependencies can be automatically detected and removed
-	using:</para>
+	as dependencies (leaf packages) can be automatically detected
+	and removed using:</para>
 
       <screen>&prompt.root; <userinput>pkg autoremove</userinput>
 Packages to be autoremoved:
@@ -642,6 +642,49 @@
 
 Proceed with autoremoval of packages [y/N]: <userinput>y</userinput>
 Deinstalling ca_root_nss-3.15.1_1... done</screen>
+
+      <para>Packages installed as dependencies are
+	called <emphasis>automatic</emphasis> packages.  Non-automatic
+	packages, i.e the packages that were explicity installed not
+	as a dependency to another package, can be listed
+	using:</para>
+
+      <screen>&prompt.root; <userinput>pkg prime-list</userinput>
+nginx
+openvpn
+sudo</screen>
+
+      <para><command>pkg prime-list</command> is an alias command
+	declared in <filename>/usr/local/etc/pkg.conf</filename>.
+	There are many others that can be used to query the package
+	database of the system.  For instance, command
+	<command>pkg prime-origins</command> can be used to get the
+	origin port directory of the list mentioned above:</para>
+
+      <screen>&prompt.root; <userinput>pkg prime-origins</userinput>
+www/nginx
+security/openvpn
+security/sudo</screen>
+
+      <para>This list can be used to rebuild all packages
+	installed on a system using build tools such as <package>
+	ports-mgmt/poudriere</package> or <package>
+	ports-mgmt/synth</package>.</para>
+
+    <para>Marking an installed package as automatic can be
+      done using:</para>
+
+      <screen>&prompt.root; <userinput>pkg set -A 1 devel/cmake</userinput></screen>
+
+      <para>Once a package is a leaf package and is marked
+	as automatic, it gets selected by
+	<command>pkg autoremove</command>.</para>
+
+      <para>Marking an installed package as <emphasis>not</emphasis>
+	automatic can be done using:</para>
+
+      <screen>&prompt.root; <userinput>pkg set -A 0 devel/cmake</userinput></screen>
+
     </sect2>
 
     <sect2 xml:id="pkgng-backup">