diff --git a/src/Mod/Material/MatPropDict.xml b/src/Mod/Material/MatPropDict.xml
index cb5ff7d870..6665707fb0 100644
--- a/src/Mod/Material/MatPropDict.xml
+++ b/src/Mod/Material/MatPropDict.xml
@@ -29,6 +29,9 @@
https://en.wikipedia.org/wiki/Young%27s_modulus
+
+ https://en.wikipedia.org/wiki/Shear_modulus
+
https://en.wikipedia.org/wiki/Poisson%27s_ratio