diff --git a/firmware/export/uda1380.h b/firmware/export/uda1380.h
index 4d4f22ff82..e0019d2bcb 100644
--- a/firmware/export/uda1380.h
+++ b/firmware/export/uda1380.h
@@ -29,7 +29,8 @@ AUDIOHW_SETTING(VOLUME,     "dB", 0,  1, -84,   0, -25)
 AUDIOHW_SETTING(BASS,       "dB", 0,  2,   0,  24,   0)
 AUDIOHW_SETTING(TREBLE,     "dB", 0,  2,   0,   6,   0)
 #ifdef HAVE_RECORDING
- /* (1/2) * 10 */
+/* microphone: -128 .. 108 -> -64 .. 54 dB gain
+ * line-in:    -128 ..  96 -> -64 .. 48 dB gain */
 AUDIOHW_SETTING(LEFT_GAIN,  "dB", 1,  1,-128,  96,   0, val * 5)
 AUDIOHW_SETTING(RIGHT_GAIN, "dB", 1,  1,-128,  96,   0, val * 5)
 AUDIOHW_SETTING(MIC_GAIN,   "dB", 1,  1,-128, 108,  16, val * 5)