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-rw-r--r--docs/manual/customize-rootfs.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/manual/customize-rootfs.txt b/docs/manual/customize-rootfs.txt
index 9d3a62ddaf..6b72a37b32 100644
--- a/docs/manual/customize-rootfs.txt
+++ b/docs/manual/customize-rootfs.txt
@@ -22,6 +22,12 @@ A filesystem overlay is a tree of files that is copied directly
etc., files called +.empty+ and files ending in +~+ are excluded from
the copy.
+
+When +BR2_ROOTFS_MERGED_USR+ is enabled, then the overlay must not
+ contain the '/bin', '/lib' or '/sbin' directories, as Buildroot will
+ create them as symbolic links to the relevant folders in '/usr'. In
+ such a situation, should the overlay have any programs or libraries,
+ they should be placed in '/usr/bin', '/usr/sbin' and '/usr/lib'.
++
As shown in xref:customize-dir-structure[], the recommended path for
this overlay is +board/<company>/<boardname>/rootfs-overlay+.