diff --git a/man/systemd-sysext.xml b/man/systemd-sysext.xml
index 60ae4aa8bf0..42e8e12df97 100644
--- a/man/systemd-sysext.xml
+++ b/man/systemd-sysext.xml
@@ -64,7 +64,7 @@
 
     <para>System extensions are supposed to be purely additive, i.e. they are supposed to include only files
     that do not exist in the underlying basic OS image. However, the underlying mechanism (overlayfs) also
-    allows removing files, but it is recommended not to make use of this.</para>
+    allows overlaying or removing files, but it is recommended not to make use of this.</para>
 
     <para>System extension images may be provided in the following formats:</para>
 
@@ -108,7 +108,9 @@
     accessed.</para>
 
     <para>Note that there is no concept of enabling/disabling installed system extension images: all
-    installed extension images are automatically activated at boot.</para>
+    installed extension images are automatically activated at boot. However, you can place a symlink
+    to <filename>/dev/null</filename> in <filename>/etc/extensions/</filename> to "mask" an image with
+    the same name in a folder with lower precedence.</para>
 
     <para>A simple mechanism for version compatibility is enforced: a system extension image must carry a
     <filename>/usr/lib/extension-release.d/extension-release.<replaceable>$name</replaceable></filename>