diff --git a/include/image-commands.mk b/include/image-commands.mk
index 381bdc0c7a..83f76c2b55 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -422,7 +422,7 @@ define Build/append-metadata
 endef
 
 # Convert a raw image into a $1 type image.
-# E.g. | qemu-image vdi
+# E.g. | qemu-image vdi <optional extra arguments to qemu-img binary>
 define Build/qemu-image
 	qemu-img convert -f raw -O $1 $@ $@.new
 	@mv $@.new $@
diff --git a/target/linux/x86/Makefile b/target/linux/x86/Makefile
index 3d03e20b05..91322c9c61 100644
--- a/target/linux/x86/Makefile
+++ b/target/linux/x86/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=i386
 BOARD:=x86
 BOARDNAME:=x86
-FEATURES:=squashfs ext4 vdi vmdk pcmcia targz fpu boot-part rootfs-part
+FEATURES:=squashfs ext4 vdi vmdk vhdx pcmcia targz fpu boot-part rootfs-part
 SUBTARGETS:=64 generic zen legacy geode 
 MAINTAINER:=Felix Fietkau <nbd@nbd.name>