diff --git a/doc/doxygen/groups/material.md b/doc/doxygen/groups/material.md
index ef446c4042d71ccfc765407bbd2da42dcebb26b9..8ceea0f344f658d2529b79e4edc1d200e2f907fa 100644
--- a/doc/doxygen/groups/material.md
+++ b/doc/doxygen/groups/material.md
@@ -84,7 +84,7 @@ The following laws are implemented:
 
 @defgroup FrictionLaws Friction Laws
 @brief Friction Laws for calculating bottom shear stress
-@details Friction laws calculate the stress between the flow and the bottom,
+@details Friction laws calculate the stress between the flowing fluid and the bottom,
 which is called bottom shear stress. The bottom shear stress is
 needed to calculate on the one hand the loss of momentum due to
 bottom friction and on the other hand the bedload transport rate.
diff --git a/dumux/material/fluidmatrixinteractions/frictionlaws/frictionlaw.hh b/dumux/material/fluidmatrixinteractions/frictionlaws/frictionlaw.hh
index 44627e2b5fec15cd0091a0959b26441c37b8d0e4..047800fd84ae2ddc95ce4668706cdf9d12ea0209 100644
--- a/dumux/material/fluidmatrixinteractions/frictionlaws/frictionlaw.hh
+++ b/dumux/material/fluidmatrixinteractions/frictionlaws/frictionlaw.hh
@@ -17,7 +17,7 @@ namespace Dumux {
  * \ingroup FrictionLaws
  * \brief Implementation of the abstract base class for friction laws.
  *
- * Friction laws calculate the stress between the flow and the bottom,
+ * Friction laws calculate the stress between the flowing fluid and the bottom,
  * which is called bottom shear stress. The bottom shear stress is
  * needed to calculate on the one hand the loss of momentum due to
  * bottom friction and on the other hand the bedload transport rate.
diff --git a/dumux/material/fluidmatrixinteractions/frictionlaws/manning.hh b/dumux/material/fluidmatrixinteractions/frictionlaws/manning.hh
index 326bfc65c74e0617bc70dd9c309d1d3abad8f027..782d29f892853372b9bc8268338aa916b9eaef71 100644
--- a/dumux/material/fluidmatrixinteractions/frictionlaws/manning.hh
+++ b/dumux/material/fluidmatrixinteractions/frictionlaws/manning.hh
@@ -19,7 +19,7 @@ namespace Dumux {
  *
  * ### Manning
  *
- * This friction law calculates the stress between the flow and the bottom,
+ * This friction law calculates the stress between the flowing fluid and the bottom,
  * which is called bottom shear stress, using the Manning friction law.
  * The bottom shear stress is needed to calculate on the one hand the loss of
  * momentum due to bottom friction and on the other hand the bedload transport rate.
diff --git a/dumux/material/fluidmatrixinteractions/frictionlaws/nikuradse.hh b/dumux/material/fluidmatrixinteractions/frictionlaws/nikuradse.hh
index 10b4110d14ed67b694f90a1ab2e0f0c0ad0415f0..6dfe5146914b029544a336424462547828985ebc 100644
--- a/dumux/material/fluidmatrixinteractions/frictionlaws/nikuradse.hh
+++ b/dumux/material/fluidmatrixinteractions/frictionlaws/nikuradse.hh
@@ -19,7 +19,7 @@ namespace Dumux {
  *
  * ### Nikuradse
  *
- * This friction law calculates the stress between the flow and the bottom,
+ * This friction law calculates the stress between the flowing fluid and the bottom,
  * which is called bottom shear stress, using the Nikuradse friction law.
  * The bottom shear stress is needed to calculate on the one hand the loss of
  * momentum due to bottom friction and on the other hand the bedload transport rate.
diff --git a/dumux/material/fluidmatrixinteractions/frictionlaws/nofriction.hh b/dumux/material/fluidmatrixinteractions/frictionlaws/nofriction.hh
index 730a75baed0d2a95ed393f771c1945b2ccb4d20e..144c5ed1d31642561f324150cf0bcdabd7332d90 100644
--- a/dumux/material/fluidmatrixinteractions/frictionlaws/nofriction.hh
+++ b/dumux/material/fluidmatrixinteractions/frictionlaws/nofriction.hh
@@ -17,7 +17,7 @@ namespace Dumux {
  *
  * ### No Friction
  *
- * This friction law sets the stress between the flow and the bottom,
+ * This friction law sets the stress between the flowing fluid and the bottom,
  * which is called bottom shear stress, to zero.
  * The bottom shear stress is needed to calculate on the one hand the loss of
  * momentum due to bottom friction and on the other hand the bedload transport rate.