diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index 5c5a2fa..d92c81f 100644
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -243,7 +243,7 @@ libevdev_set_fd(struct libevdev* dev, int fd)
 
 			dev->abs_info[i] = abs_info;
 			if (i == ABS_MT_SLOT) {
-				dev->num_slots = abs_info.maximum + 1; /* FIXME: non-zero min? */
+				dev->num_slots = abs_info.maximum + 1;
 				dev->current_slot = abs_info.value;
 			}
 
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h
index 9d2991e..613d930 100644
--- a/libevdev/libevdev.h
+++ b/libevdev/libevdev.h
@@ -533,11 +533,11 @@ int libevdev_fetch_slot_value(const struct libevdev *dev, unsigned int slot, uns
  *
  * Get the number of slots supported by this device.
  *
- * Note that the slot offset may be non-zero, use libevdev_get_abs_min() or
- * libevdev_get_abs_info() to get the minimum slot number.
- *
  * @return The number of slots supported, or -1 if the device does not provide
  * any slots
+ *
+ * @note A device may provide ABS_MT_SLOT but a total number of 0 slots. Hence
+ * the return value of -1 for "device does not provide slots at all"
  */
 int libevdev_get_num_slots(const struct libevdev *dev);