diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index e7008648735..b5a02f0a788 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -1455,33 +1455,25 @@ After=sys-subsystem-net-devices-ens1.device
- Combine multiple directory trees into one
- overlay file system and mount it into the container. Takes a
- list of colon-separated paths to the directory trees to
- combine and the destination mount point.
+ Combine multiple directory trees into one overlay file system and mount it into the
+ container. Takes a list of colon-separated paths to the directory trees to combine and the
+ destination mount point.
- Backslash escapes are interpreted in the paths, so
- \: may be used to embed colons in the paths.
+ Backslash escapes are interpreted in the paths, so \: may be used to embed
+ colons in the paths.
+
+ If three or more paths are specified, then the last specified path is the destination mount
+ point in the container, all paths specified before refer to directory trees on the host and are
+ combined in the specified order into one overlay file system. The left-most path is hence the lowest
+ directory tree, the second-to-last path the highest directory tree in the stacking order. If
+ is used instead of , a read-only overlay
+ file system is created. If a writable overlay file system is created, all changes made to it are
+ written to the highest directory tree in the stacking order, i.e. the second-to-last specified.
- If three or more paths are specified, then the last
- specified path is the destination mount point in the
- container, all paths specified before refer to directory trees
- on the host and are combined in the specified order into one
- overlay file system. The left-most path is hence the lowest
- directory tree, the second-to-last path the highest directory
- tree in the stacking order. If
- is used instead of , a read-only
- overlay file system is created. If a writable overlay file
- system is created, all changes made to it are written to the
- highest directory tree in the stacking order, i.e. the
- second-to-last specified.
-
- If only two paths are specified, then the second
- specified path is used both as the top-level directory tree in
- the stacking order as seen from the host, as well as the mount
- point for the overlay file system in the container. At least
- two paths have to be specified.
+ If only two paths are specified, then the second specified path is used both as the top-level
+ directory tree in the stacking order as seen from the host, as well as the mount point for the
+ overlay file system in the container. At least two paths have to be specified.The source paths may optionally be prefixed with + character. If so they are
taken relative to the image's root directory. The uppermost source path may also be specified as an