diff --git a/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/c_ConcentrationDependent.md b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/c_ConcentrationDependent.md
new file mode 100644
index 0000000000000000000000000000000000000000..f5ce8b16c79f1e13fbd4869721b44758cf7efa50
--- /dev/null
+++ b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/c_ConcentrationDependent.md
@@ -0,0 +1 @@
+\copydoc MaterialLib::Fluid::LinearConcentrationDependentDensity
diff --git a/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_difference_ratio.md b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_difference_ratio.md
new file mode 100644
index 0000000000000000000000000000000000000000..202846b20b248e49fd85150859b328879bfbc5eb
--- /dev/null
+++ b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_difference_ratio.md
@@ -0,0 +1 @@
+\f$ \bar \alpha\f$ is the fluid density difference ratio
diff --git a/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_reference_concentration.md b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_reference_concentration.md
new file mode 100644
index 0000000000000000000000000000000000000000..e200f1d8ff747b570284bad199c9d476efa16b0b
--- /dev/null
+++ b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_reference_concentration.md
@@ -0,0 +1 @@
+\f$ C_{\text{ref}}\f$ is the reference concentration
diff --git a/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_reference_density.md b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_reference_density.md
new file mode 100644
index 0000000000000000000000000000000000000000..37ddf686c4ba3c63f4c008ada63a62d589641b8b
--- /dev/null
+++ b/Documentation/ProjectFile/material/fluid/density/ConcentrationDependent/t_fluid_density_reference_density.md
@@ -0,0 +1 @@
+\f$ \varrho_{\text{ref}}\f$ is the reference density
diff --git a/MaterialLib/Fluid/Density/LinearConcentrationDependentDensity.h b/MaterialLib/Fluid/Density/LinearConcentrationDependentDensity.h
index 9926ef7bc62d630f811c3f5e8d0cf7810a8333a9..1754c912ecc5d23f5db39097d73e174239f995c6 100644
--- a/MaterialLib/Fluid/Density/LinearConcentrationDependentDensity.h
+++ b/MaterialLib/Fluid/Density/LinearConcentrationDependentDensity.h
@@ -20,6 +20,12 @@ namespace MaterialLib
 namespace Fluid
 {
 /// Linear concentration dependent density model.
+/// \f[ \varrho = \varrho_{\text{ref}}
+/// (1 + \bar \alpha (C - C_{\text{ref}})) \f]
+/// where
+/// - \f$ \varrho_{\text{ref}}\f$ is the reference density
+/// - \f$ \bar \alpha\f$ is the fluid density difference ratio
+/// - \f$ C_{\text{ref}}\f$ is the reference concentration
 class LinearConcentrationDependentDensity final : public FluidProperty
 {
 public: