diff --git a/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi b/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi
index 83750ab..aacf181 100644
--- a/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi
+++ b/arch/arm/dts/fsl-ls1028a-kontron-sl28-u-boot.dtsi
@@ -64,7 +64,7 @@
 
 &binman {
 	u-boot-update {
-		filename = "u-boot.update";
+		filename = "u-boot-update.bin";
 
 		fit {
 			description = "FIT update image";
diff --git a/doc/board/kontron/sl28.rst b/doc/board/kontron/sl28.rst
index 44435d9..2cb8ec6 100644
--- a/doc/board/kontron/sl28.rst
+++ b/doc/board/kontron/sl28.rst
@@ -39,12 +39,12 @@
 ------------
 
 After the build finished, there will be an update image called
-u-boot.update. This can either be used in the DFU mode (which isn't
+u-boot-update.bin. This can either be used in the DFU mode (which isn't
 supported yet) or encapsulated in an EFI UpdateCapsule.
 
 To build the capsule use the following command
 
- $ tools/mkeficapsule -f u-boot.update -i 1 UpdateUboot
+ $ tools/mkeficapsule -f u-boot-update.bin -i 1 UpdateUboot
 
 Afterward you can copy this file to your ESP into the /EFI/UpdateCapsule/
 folder. On the next EFI boot this will automatically update your