diff --git a/src/biss0001/biss0001.hpp b/src/biss0001/biss0001.hpp
index 7176bb24..9d487aa9 100644
--- a/src/biss0001/biss0001.hpp
+++ b/src/biss0001/biss0001.hpp
@@ -46,7 +46,12 @@ namespace upm {
      *
      * @brief API for the BISS0001 Motion Sensor
      *
-     * UPM module for the BISS0001 Motion Sensor
+     * PIR sensors allow you to sense motion, almost always used to detect
+     * whether a human has moved in or out of the sensors range. They are
+     * small, inexpensive, low-power, easy to use and don't wear out. For that
+     * reason they are commonly found in appliances and gadgets used in homes
+     * or businesses. They are often referred to as PIR, "Passive Infrared",
+     * "Pyroelectric", or "IR motion" sensors.
      *
      * @image html biss0001.jpg
      * @snippet biss0001.cxx Interesting
diff --git a/src/dfrorp/dfrorp.hpp b/src/dfrorp/dfrorp.hpp
index 5165c479..ec61ade1 100644
--- a/src/dfrorp/dfrorp.hpp
+++ b/src/dfrorp/dfrorp.hpp
@@ -51,7 +51,7 @@ namespace upm {
    *
    * @brief API for the DFRobot ORP (Oxidation/Reduction Potential) Sensor
    *
-   * The driver was tested with the DFRobot ORP (Oxidation/Reduction
+   * This library was tested with the DFRobot ORP (Oxidation/Reduction
    * Potential) Sensor.
    *
    * To calibrate:
diff --git a/src/mma7361/mma7361.hpp b/src/mma7361/mma7361.hpp
index f87cd685..a2739e04 100644
--- a/src/mma7361/mma7361.hpp
+++ b/src/mma7361/mma7361.hpp
@@ -50,7 +50,7 @@ namespace upm {
    *
    * @brief API for the DFRobot MMA7361 Analog Accelerometer
    *
-   * The driver was tested with the DFRobot MMA7361 Analog
+   * This library was tested with the DFRobot MMA7361 Analog
    * Accelerometer.  It supports 3 Axes with a selectable 1.5G and 6G
    * sensitivity.
    *
diff --git a/src/urm37/urm37.hpp b/src/urm37/urm37.hpp
index 40ef6266..ff53a7d2 100644
--- a/src/urm37/urm37.hpp
+++ b/src/urm37/urm37.hpp
@@ -53,7 +53,7 @@ namespace upm {
      *
      * @brief API for the DFRobot URM37 Ultrasonic Ranger
      *
-     * The driver was tested with the DFRobot URM37 Ultrasonic Ranger,
+     * This library was tested with the DFRobot URM37 Ultrasonic Ranger,
      * V4.  It has a range of between 5 and 500 centimeters (cm).  It
      * supports both analog distance measurement, and UART based
      * temperature and distance measurements.  This driver does not