Added small docstring to motorVelocity explaining an important caveat.

src/sinqController.h

@@ -267,6 +267,19 @@ class HIDDEN sinqController : public asynMotorController {
     int motorMoveVel() { return motorMoveVel_; }
     int motorHome() { return motorHome_; }
     int motorStop() { return motorStop_; }
+
+    /**
+     * @brief Index for the paramLib entry which writes the motor speed in steps
+     * / s into the RVEL field of the motor record.
+     *
+     * Important: Only write to this field if the motor is moving. As discussed
+     * here: https://github.com/epics-modules/motor/pull/236, otherwise a race
+     * condition might occur and the move or moveVelocity might be called with
+     * the readback velocity instead of that written into the VELO / JVEL
+     * fields.
+     *
+     * @return int
+     */
     int motorVelocity() { return motorVelocity_; }
     int motorVelBase() { return motorVelBase_; }
     int motorAccel() { return motorAccel_; }