diff --git a/diskimage_builder/elements/block-device-efi-lvm/README.rst b/diskimage_builder/elements/block-device-efi-lvm/README.rst
index cb6b479ba..e33ee596f 100644
--- a/diskimage_builder/elements/block-device-efi-lvm/README.rst
+++ b/diskimage_builder/elements/block-device-efi-lvm/README.rst
@@ -14,3 +14,5 @@ Note on x86 this provides the extra `BIOS boot partition
 <https://en.wikipedia.org/wiki/BIOS_boot_partition>`__ and a EFI boot
 partition for maximum compatability.
 
+This element requires ``dosfstools`` and ``lvm2`` packages to be installed
+on the build system.
diff --git a/diskimage_builder/elements/block-device-efi/README.rst b/diskimage_builder/elements/block-device-efi/README.rst
index 804f713d7..dc3b6201e 100644
--- a/diskimage_builder/elements/block-device-efi/README.rst
+++ b/diskimage_builder/elements/block-device-efi/README.rst
@@ -9,3 +9,5 @@ Note on x86 this provides the extra `BIOS boot partition
 <https://en.wikipedia.org/wiki/BIOS_boot_partition>`__ and a EFI boot
 partition for maximum compatability.
 
+This element requires ``mkfs.vfat`` command to be available on the build
+system, usually included in the dosfstools OS package.