diff --git a/src/2_debye_model.md b/src/2_debye_model.md
index d11831f3e85c7f52d80a546c4b36413d2cd02372..7e4cbfb940d10d34a584c5b4efd15e22f09b17df 100644
--- a/src/2_debye_model.md
+++ b/src/2_debye_model.md
@@ -182,7 +182,7 @@ $$
 
 We can trace back all the factors in the density of states to their origin:
 
-* $(L/2\pi)^3$ is the volume per allowed wave in the reciprocal space
+* $(L/2\pi)^3$ is the number of possible waves per unit volume in the reciprocal space
 * $4π$ is the area of a unit sphere, the result of integration over $d \varphi$ and $dθ$
 * $ω^2$ is due to the area of this sphere being proportional to its squared radius
 * $3$ is the number of possible polarizations in 3D