diff --git a/doc/doxygen/groups/material.md b/doc/doxygen/groups/material.md
index 6a245aad9eab7a5f44c1e09b7001f6f2c8894129..2d79003b36c0178d4fb38b89a701060173a315f9 100644
--- a/doc/doxygen/groups/material.md
+++ b/doc/doxygen/groups/material.md
@@ -87,7 +87,8 @@ The following laws are implemented:
 @ingroup Fluidmatrixinteractions
 
 @defgroup DispersionTensors Dispersion Tensors
-@brief Dispersion Tensors
+@brief Dispersion Tensors for calculating the dispersion in all spatial dimensions
+@details Dispersion is caused by particles traveling with different velocity through the porous medium. A particle in the middle of a pore has a higher velociy than a particle close to the grain. Additionaly, due to the tortuosity of the porous medium particles have to take different paths through it. This leads to an effect, which is like an enhanced diffusion, equalizing concentration gradients. 
 @ingroup Fluidmatrixinteractions
 
 @defgroup PoreNetwork Pore Network