diff --git a/src/3_drude_model.md b/src/3_drude_model.md
index daa14f72e2f72c8744c8b01afffcc6589a0bfcc7..855e119d48b163d96ec7cb37fb79c7ea88a8b294 100644
--- a/src/3_drude_model.md
+++ b/src/3_drude_model.md
@@ -270,7 +270,7 @@ While most materials have $R_\mathrm{H}<0$, interestingly some materials are fou
 1. How does the resistance of a purely 2D material depend on its size?
 2. Check that the units of mobility and the Hall coefficient are correct.  
    (As you should always do!)
-3. Explain why the scattering rates due to different types of scattering events add up in a reciprocal way. 
+3. Explain why the scattering times due to different types of scattering events add up in a reciprocal way. 
 
 ### Exercise 1: Extracting quantities from basic Hall measurements
 We apply a magnetic field $\bf B$ along the $z$-direction to a planar (two-dimensional) sample that sits in the $xy$ plane. The sample has width $W$ in the $y$-direction, length $L$ in the $x$-direction and we apply a current $I$ along the $x$-direction.