diff --git a/cura/Settings/CuraContainerStack.py b/cura/Settings/CuraContainerStack.py
index d14f2d04c9..fc90e3b239 100755
--- a/cura/Settings/CuraContainerStack.py
+++ b/cura/Settings/CuraContainerStack.py
@@ -5,7 +5,7 @@ import os.path
 
 from typing import Any, Optional
 
-from PyQt5.QtCore import pyqtProperty, pyqtSignal
+from PyQt5.QtCore import pyqtProperty, pyqtSignal, QObject
 from UM.FlameProfiler import pyqtSlot
 
 from UM.Decorators import override
@@ -250,7 +250,7 @@ class CuraContainerStack(ContainerStack):
     ##  Get the definition container.
     #
     #   \return The definition container. Should always be a valid container, but can be equal to the empty InstanceContainer.
-    @pyqtProperty(DefinitionContainer, fset = setDefinition, notify = pyqtContainersChanged)
+    @pyqtProperty(QObject, fset = setDefinition, notify = pyqtContainersChanged)
     def definition(self) -> DefinitionContainer:
         return self._containers[_ContainerIndexes.Definition]
 
diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index 96ccc89ccf..8738b044fb 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -470,7 +470,7 @@ class MachineManager(QObject):
 
         return ""
 
-    @pyqtProperty("QObject", notify = globalContainerChanged)
+    @pyqtProperty(QObject, notify = globalContainerChanged)
     def activeMachine(self) -> "GlobalStack":
         return self._global_container_stack
 
diff --git a/resources/qml/SidebarHeader.qml b/resources/qml/SidebarHeader.qml
index e4070c5d43..32e1db607a 100644
--- a/resources/qml/SidebarHeader.qml
+++ b/resources/qml/SidebarHeader.qml
@@ -1,4 +1,4 @@
-// Copyright (c) 2015 Ultimaker B.V.
+// Copyright (c) 2017 Ultimaker B.V.
 // Cura is released under the terms of the AGPLv3 or higher.
 
 import QtQuick 2.2
@@ -159,7 +159,7 @@ Column
         visible: !extruderSelectionRow.visible
     }
 
-    Row
+    Item
     {
         id: variantRow
 
@@ -196,16 +196,59 @@ Column
             }
 
             anchors.verticalCenter: parent.verticalCenter
-            width: parent.width * 0.45 - UM.Theme.getSize("default_margin").width
+            anchors.left: variantRow.left
+            width: parent.width * 0.30
             font: UM.Theme.getFont("default");
             color: UM.Theme.getColor("text");
         }
 
+        Button
+        {
+            id: materialInfoButton
+            height: parent.height * 0.70
+            width: height
+
+            anchors.left: variantLabel.right
+            anchors.leftMargin: UM.Theme.getSize("default_margin").width * 2
+            anchors.verticalCenter: parent.verticalCenter
+
+            visible: extrudersList.visible
+
+            text: "i"
+            style: UM.Theme.styles.info_button
+
+            onClicked:
+            {
+                // open the material URL with web browser
+                var version = UM.Application.version;
+                var machineName = Cura.MachineManager.activeMachine.definition.id;
+
+                var url = "https://ultimaker.com/materialcompatibility/" + version + "/" + machineName;
+                Qt.openUrlExternally(url);
+            }
+
+            onHoveredChanged:
+            {
+                if (hovered)
+                {
+                    var content = catalog.i18nc("@tooltip", "Click to check the material compatibility on Ultimaker.com.");
+                    base.showTooltip(
+                        extruderSelectionRow, Qt.point(0, extruderSelectionRow.height + variantRow.height / 2), catalog.i18nc("@tooltip", content)
+                    );
+                }
+                else
+                {
+                    base.hideTooltip();
+                }
+            }
+        }
+
         Item
         {
             anchors.verticalCenter: parent.verticalCenter
+            anchors.right: parent.right
 
-            width: parent.width * 0.55 + UM.Theme.getSize("default_margin").width
+            width: parent.width * 0.50 + UM.Theme.getSize("default_margin").width
             height: UM.Theme.getSize("setting_control").height
 
             ToolButton {
diff --git a/resources/themes/cura/styles.qml b/resources/themes/cura/styles.qml
index ffe866f2c6..496cc8e489 100755
--- a/resources/themes/cura/styles.qml
+++ b/resources/themes/cura/styles.qml
@@ -8,6 +8,37 @@ import QtQuick.Controls.Styles 1.1
 import UM 1.1 as UM
 
 QtObject {
+    property Component info_button: Component {
+        ButtonStyle {
+            label: Text {
+                renderType: Text.NativeRendering
+                verticalAlignment: Text.AlignVCenter
+                horizontalAlignment: Text.AlignHCenter
+                font: UM.Theme.getFont("small")
+                color: UM.Theme.getColor("button_text")
+                text: control.text
+            }
+
+            background: Rectangle {
+                implicitHeight: UM.Theme.getSize("info_button").height
+                implicitWidth: width
+                border.width: 0
+                radius: height * 0.5
+
+                color: {
+                    if (control.pressed) {
+                        return UM.Theme.getColor("button_active");
+                    } else if (control.hovered) {
+                        return UM.Theme.getColor("button_hover");
+                    } else {
+                        return UM.Theme.getColor("button");
+                    }
+                }
+                Behavior on color { ColorAnimation { duration: 50; } }
+            }
+        }
+    }
+
     property Component mode_switch: Component {
         SwitchStyle {
             groove: Rectangle {
diff --git a/resources/themes/cura/theme.json b/resources/themes/cura/theme.json
index 5f0b3656c8..e7d49cb5e8 100644
--- a/resources/themes/cura/theme.json
+++ b/resources/themes/cura/theme.json
@@ -329,6 +329,8 @@
 
         "infill_button_margin": [0.5, 0.5],
 
-        "jobspecs_line": [2.0, 2.0]
+        "jobspecs_line": [2.0, 2.0],
+
+        "info_button": [0.6, 0.6]
     }
 }