add SR_UNIT_DECIBEL_VOLT (dBu)

diff --git a/libsigrok.h b/libsigrok.h
index da770f44254d6180cba662a817fc4789aceb1bf2..251a2e4d4d247cf64fa9af12699a1d08f6202a8c 100644 (file)
--- a/libsigrok.h
+++ b/libsigrok.h
@@ -167,14 +167,16 @@ enum {
        SR_UNIT_PERCENTAGE,
        SR_UNIT_BOOLEAN,
        SR_UNIT_SECOND,
-       /** Unit of conductance, the inverse of resistance */
+       /** Unit of conductance, the inverse of resistance.  */
        SR_UNIT_SIEMENS,
        /** An absolute measurement of power, in decibels, referenced to
-        * 1 milliwatt */
+        * 1 milliwatt (dBu). */
        SR_UNIT_DECIBEL_MW,
-       /** Measurements that intrinsically, do not have units attached, such
-        * as ratios, gains, etc
-        * Specifically, a transistor's gain (hFE) is a unitless quantity*/
+       /** Voltage in decibel, referenced to 1 volt (dBV). */
+       SR_UNIT_DECIBEL_VOLT,
+       /** Measurements that intrinsically do not have units attached, such
+        * as ratios, gains, etc. Specifically, a transistor's gain (hFE) is
+        * a unitless quantity. */
        SR_UNIT_UNITLESS,
 };