diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 27b58432b9..ee2ca6aa10 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -1908,7 +1908,8 @@ SystemCallErrorNumber=EPERM</programlisting>
 
         <para>The files listed with this directive will be read shortly before the process is executed (more
         specifically, after all processes from a previous unit state terminated.  This means you can generate these
-        files in one unit state, and read it with this option in the next).</para>
+        files in one unit state, and read it with this option in the next.  The files are read from the file
+        system of the service manager, before any file system changes like bind mounts take place).</para>
 
         <para>Settings from these files override settings made with <varname>Environment=</varname>. If the same
         variable is set twice from these files, the files will be read in the order they are specified and the later