diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
index 0b3653c293a..fc0898bb325 100644
--- a/src/gallium/drivers/radeonsi/si_get.c
+++ b/src/gallium/drivers/radeonsi/si_get.c
@@ -953,11 +953,13 @@ void si_init_screen_get_functions(struct si_screen *sscreen)
        * ------------------------------------------------------------------------------------------------------------------
        * gfx6,7 |     1 , - , -     |  1 , -   |  1 , -   |1/4, - ,1/16|     - , -      |  - , -   |   - , -   | - ,MAD,FMA
        * gfx8   |     1 , 1 , -     |  1 , -   |  - , -   |1/4, 1 ,1/16|     - , -      |  - , -   |   - , -   |MAD,MAD,FMA
-       * gfx9   |     1 , 1 , -     |  1 , -   |  1 , -   | 1 , 1 ,1/16|     - , -      |  - , 1   |   2 , -   |FMA,MAD,FMA
-       * gfx10  |     1 , 1 , -     |  1 , -   |  1 , -   | 1 , 1 ,1/16|     1 , 1      |  - , -   |   2 , 2   |FMA,MAD,FMA
+       * gfx9   |     1 ,1|0, -     |  1 , -   |  - , -   | 1 , 1 ,1/16|    0|1, -      |  - , 1   |   2 , -   |FMA,MAD,FMA
+       * gfx10  |     1 , - , -     |  1 , -   |  1 , -   | 1 , 1 ,1/16|     1 , 1      |  - , -   |   2 , 2   |FMA,MAD,FMA
        * gfx10.3|     - , - , -     |  - , -   |  - , -   | 1 , 1 ,1/16|     1 , 1      |  1 , -   |   2 , 2   |  all FMA
        *
        * Tahiti, Hawaii, Carrizo, Vega20: FMA_F32 is full rate, FMA_F64 is 1/4
+       * gfx9 supports MAD_F16 only on Vega10, Raven, Raven2, Renoir.
+       * gfx9 supports FMAC_F32 only on Vega20, but doesn't support FMAAK and FMAMK.
        *
        * gfx8 prefers MAD for F16 because of MAC/MADAK/MADMK.
        * gfx9 and newer prefer FMA for F16 because of the packed instruction.