diff --git a/include/dm/device.h b/include/dm/device.h
index 0a9718a..ef6241b 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -738,7 +738,7 @@
  *
  * @parent:	Parent device to search
  * @uclass_id:	Uclass to look for
- * @devp:	Returns device found, if any
+ * @devp:	Returns device found, if any, else NULL
  * @return 0 if found, else -ENODEV
  */
 int device_find_first_inactive_child(const struct udevice *parent,
@@ -750,7 +750,7 @@
  *
  * @parent: Parent device to search
  * @uclass_id:	Uclass to look for
- * @devp: Returns first child device in that uclass, if any
+ * @devp: Returns first child device in that uclass, if any, else NULL
  * @return 0 if found, else -ENODEV
  */
 int device_find_first_child_by_uclass(const struct udevice *parent,
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index da0c1bf..15e5f9e 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -354,7 +354,7 @@
  * The device returned is probed if necessary, and ready for use
  *
  * @devp: On entry, pointer to device to lookup. On exit, returns pointer
- * to the next device in the uclass if no error occurred, or -ENODEV if
+ * to the next device in the uclass if no error occurred, or NULL if
  * there is no next device.
  * @return 0 if found, -ENODEV if not found, other -ve on error
  */