diff --git a/host/libhackrf/src/hackrf.h b/host/libhackrf/src/hackrf.h
index 130f33e9..1c8bc1a0 100644
--- a/host/libhackrf/src/hackrf.h
+++ b/host/libhackrf/src/hackrf.h
@@ -150,10 +150,10 @@ extern ADDAPI int ADDCALL hackrf_set_amp_enable(hackrf_device* device, const uin
 
 extern ADDAPI int ADDCALL hackrf_board_partid_serialno_read(hackrf_device* device, read_partid_serialno_t* read_partid_serialno);
 
-/* range 0-40 step 8db */
+/* range 0-40 step 8d, IF gain in osmosdr  */
 extern ADDAPI int ADDCALL hackrf_set_lna_gain(hackrf_device* device, uint32_t value);
 
-/* range 0-62 step 2db */
+/* range 0-62 step 2db, BB gain in osmosdr */
 extern ADDAPI int ADDCALL hackrf_set_vga_gain(hackrf_device* device, uint32_t value);
 
 /* range 0-47 step 1db */