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diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index d56eee3bb4..a57c09877a 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -3989,6 +3989,12 @@ system and gives an overview of their function and contents.
3989 3989
3990 IMAGE_ROOTFS_EXTRA_SPACE = "41943040" 3990 IMAGE_ROOTFS_EXTRA_SPACE = "41943040"
3991 3991
3992 :term:`IMAGE_ROOTFS_MAXSIZE`
3993 Defines the maximum size in Kbytes for the generated image. If the
3994 generated image size is above that, the build will fail. It's a good
3995 idea to set this variable for images that need to fit on a limited
3996 space (e.g. SD card, a fixed-size partition, ...).
3997
3992 :term:`IMAGE_ROOTFS_SIZE` 3998 :term:`IMAGE_ROOTFS_SIZE`
3993 Defines the size in Kbytes for the generated image. The OpenEmbedded 3999 Defines the size in Kbytes for the generated image. The OpenEmbedded
3994 build system determines the final size for the generated image using 4000 build system determines the final size for the generated image using