diff --git a/src/Mod/Fem/MechanicalMaterial.py b/src/Mod/Fem/MechanicalMaterial.py
index 16e7c23f2..d822b7b9b 100644
--- a/src/Mod/Fem/MechanicalMaterial.py
+++ b/src/Mod/Fem/MechanicalMaterial.py
@@ -21,7 +21,7 @@
 # ***************************************************************************
 
 __title__ = "MechanicalMaterial"
-__author__ = "Juergen Riegel"
+__author__ = "Juergen Riegel, Bernd Hahnebach"
 __url__ = "http://www.freecadweb.org"
 
 
diff --git a/src/Mod/Fem/_CommandMechanicalMaterial.py b/src/Mod/Fem/_CommandMechanicalMaterial.py
index 596580df4..9c67eddd6 100644
--- a/src/Mod/Fem/_CommandMechanicalMaterial.py
+++ b/src/Mod/Fem/_CommandMechanicalMaterial.py
@@ -21,7 +21,7 @@
 # ***************************************************************************
 
 __title__ = "_CommandMechanicalMaterial"
-__author__ = "Juergen Riegel"
+__author__ = "Juergen Riegel, Bernd Hahnebach"
 __url__ = "http://www.freecadweb.org"
 
 
diff --git a/src/Mod/Fem/_MechanicalMaterial.py b/src/Mod/Fem/_MechanicalMaterial.py
index 6401b88bc..de941f90a 100644
--- a/src/Mod/Fem/_MechanicalMaterial.py
+++ b/src/Mod/Fem/_MechanicalMaterial.py
@@ -21,7 +21,7 @@
 # ***************************************************************************
 
 __title__ = "_MechanicalMaterial"
-__author__ = "Juergen Riegel"
+__author__ = "Juergen Riegel, Bernd Hahnebach"
 __url__ = "http://www.freecadweb.org"
 
 
diff --git a/src/Mod/Fem/_MechanicalMaterialTaskPanel.py b/src/Mod/Fem/_MechanicalMaterialTaskPanel.py
index b8417b638..3a128bc85 100644
--- a/src/Mod/Fem/_MechanicalMaterialTaskPanel.py
+++ b/src/Mod/Fem/_MechanicalMaterialTaskPanel.py
@@ -21,7 +21,7 @@
 # ***************************************************************************
 
 __title__ = "_MechanicalMaterialTaskPanel"
-__author__ = "Juergen Riegel"
+__author__ = "Juergen Riegel, Bernd Hahnebach"
 __url__ = "http://www.freecadweb.org"
 
 
diff --git a/src/Mod/Fem/_ViewProviderMechanicalMaterial.py b/src/Mod/Fem/_ViewProviderMechanicalMaterial.py
index 287438d49..f6c8895a0 100644
--- a/src/Mod/Fem/_ViewProviderMechanicalMaterial.py
+++ b/src/Mod/Fem/_ViewProviderMechanicalMaterial.py
@@ -21,7 +21,7 @@
 # ***************************************************************************
 
 __title__ = "_ViewProviderMechanicalMaterial"
-__author__ = "Juergen Riegel"
+__author__ = "Juergen Riegel, Bernd Hahnebach"
 __url__ = "http://www.freecadweb.org"