diff --git a/gnss/2.0/IGnssMeasurementCallback.hal b/gnss/2.0/IGnssMeasurementCallback.hal
index e055f7a..76c7943 100644
--- a/gnss/2.0/IGnssMeasurementCallback.hal
+++ b/gnss/2.0/IGnssMeasurementCallback.hal
@@ -402,6 +402,8 @@
          * Value "C" represents GPS L1 C/A,  GPS L2 C/A, GLONASS G1 C/A, GLONASS G2 C/A, GALILEO E1C,
          * GALILEO E6C, SBAS L1 C/A, QZSS L1 C/A, IRNSS L5C.
          *
+         * value "D" represents BDS B1C D.
+         *
          * Value "I" represents GPS L5 I, GLONASS G3 I, GALILEO E5a I, GALILEO E5b I, GALILEO E5a+b I,
          * SBAS L5 I, QZSS L5 I, BDS B1 I, BDS B2 I, BDS B3 I.
          *
@@ -411,7 +413,7 @@
          *
          * Value "N" represents GPS L1 codeless, GPS L2 codeless.
          *
-         * Value "P" represents GPS L1P, GPS L2P, GLONASS G1P, GLONASS G2P.
+         * Value "P" represents GPS L1P, GPS L2P, GLONASS G1P, GLONASS G2P, BDS B1C P.
          *
          * Value "Q" represents GPS L5 Q, GLONASS G3 Q, GALILEO E5a Q, GALILEO E5b Q, GALILEO E5a+b Q,
          * SBAS L5 Q, QZSS L5 Q, BDS B1 Q, BDS B2 Q, BDS B3 Q.
@@ -423,7 +425,7 @@
          * Value "X" represents GPS L1C (D+P), GPS L2C (M+L), GPS L5 (I+Q), GLONASS G3 (I+Q),
          * GALILEO E1 (B+C), GALILEO E5a (I+Q), GALILEO E5b (I+Q), GALILEO E5a+b(I+Q),
          * GALILEO E6 (B+C), SBAS L5 (I+Q), QZSS L1C (D+P), QZSS L2C (M+L), QZSS L5 (I+Q),
-         * LEX(6) (S+L), BDS B1 (I+Q), BDS B2 (I+Q), BDS B3 (I+Q), IRNSS L5 (B+C).
+         * LEX(6) (S+L), BDS B1 (I+Q), BDS B1C (D+P), BDS B2 (I+Q), BDS B3 (I+Q), IRNSS L5 (B+C).
          *
          * Value "Y" represents GPS L1Y, GPS L2Y.
          *