diff --git a/GUI/coregui/Models/GroupInfoCatalogue.cpp b/GUI/coregui/Models/GroupInfoCatalogue.cpp
index c083a0303b45ddb493c09dc2fbb71b2b8891621a..a1f6401fd8769716c5b83ab08d473414eef96d28 100644
--- a/GUI/coregui/Models/GroupInfoCatalogue.cpp
+++ b/GUI/coregui/Models/GroupInfoCatalogue.cpp
@@ -158,6 +158,11 @@ GroupInfoCatalogue::GroupInfoCatalogue()
     info.add(Constants::PoissonNoiseBackgroundType, "Poisson noise");
     info.setDefaultType(Constants::BackgroundNoneType);
     addInfo(info);
+
+    info = GroupInfo(Constants::MaterialDataGroup);
+    info.add(Constants::MaterialDataType, "Refractive index");
+    info.setDefaultType(Constants::MaterialDataType);
+    addInfo(info);
 }
 
 GroupInfo GroupInfoCatalogue::groupInfo(const QString& groupType) const
diff --git a/GUI/coregui/Models/item_constants.h b/GUI/coregui/Models/item_constants.h
index fec701a1638edd0a4618b08c9ee8790dc54cd9f4..fb446673446294cff9813d9ff3a2bc8a59cb9831 100644
--- a/GUI/coregui/Models/item_constants.h
+++ b/GUI/coregui/Models/item_constants.h
@@ -199,6 +199,7 @@ const ModelType ResolutionFunctionGroup = "Resolution function group";
 const ModelType MinimizerLibraryGroup = "Minimizer library group";
 const ModelType RealLimitsGroup = "RealLimits group";
 const ModelType BackgroundGroup = "Background group";
+const ModelType MaterialDataGroup = "Material data group";
 
 // --- Units&Constants----------------------------------------------------------