diff --git a/documentation/dev-manual/packages.rst b/documentation/dev-manual/packages.rst
index 0e991e409a..6c208555e0 100644
--- a/documentation/dev-manual/packages.rst
+++ b/documentation/dev-manual/packages.rst
@@ -607,6 +607,13 @@ subsequent sections are necessary to configure the target. You should
 set these variables before building the image in order to produce a
 correctly configured image.
 
+.. note::
+
+   Your image will need enough free storage space to run package upgrades,
+   especially if many of them need to be downloaded at the same time.
+   You should make sure images are created with enough free space
+   by setting the :term:`IMAGE_ROOTFS_EXTRA_SPACE` variable.
+
 When your build is complete, your packages reside in the
 ``${TMPDIR}/deploy/packageformat`` directory. For example, if
 ``${``\ :term:`TMPDIR`\ ``}`` is