diff --git a/mdbook/src/14-punch-o-meter/README.md b/mdbook/src/14-punch-o-meter/README.md
index ade5248..ab325af 100644
--- a/mdbook/src/14-punch-o-meter/README.md
+++ b/mdbook/src/14-punch-o-meter/README.md
@@ -2,10 +2,13 @@
 
 In this section we'll be playing with the accelerometer that's in the board.
 
-What are we building this time? A punch-o-meter! We'll be measuring the power of your jabs. Well,
+What are we building this time? A [punch-o-meter]! We'll be measuring the power of your jabs. Well,
 actually the maximum acceleration that you can reach because acceleration is what accelerometers
 measure. Strength and acceleration are proportional though so it's a good approximation.
 
-As we already know from previous chapters the accelerometer is built inside the LSM303AGR package.
-Just like the magnetometer, it is accessible using the I2C bus. The accelerometer also has the
-same coordinate system as the magnetometer.
+As we already know from [previous chapters](../12-i2c/index.html) the accelerometer is built inside
+the [`lsm303agr`] package. Just like the magnetometer, it is accessible using the I2C bus. The
+accelerometer also has the same coordinate system as the magnetometer.
+
+[punch-o-meter]: https://en.wikipedia.org/wiki/Strength_tester_machine
+[`lsm303agr`]: https://crates.io/crates/lsm303agr