diff --git a/Documentation/README.md b/Documentation/README.md
index 9fbea3d..f94e098 100644
--- a/Documentation/README.md
+++ b/Documentation/README.md
@@ -561,6 +561,14 @@ Lines can be used to add markup in 3D. Each line is defined by three dimensional
 
 ClippingPlanes can be used to define a subsection of a building model that is related to the topic. Each clipping plane is defined by Location and Direction. The Direction vector points in the _invisible_ direction meaning the half-space that is clipped.
 
+### Markers (optional)
+
+A marker is a way to pinpoint a location in the 3D model. Each vendor can decide how these markers should be rendered.
+
+**Best practice**
+Render the markers based on the topic properties.
+Example: Red markers for open topics, and green markers for closed topics
+
 ### Bitmap (optional)
 
 A list of bitmaps can be used to add more information, for example, text in the visualization. It has the following elements:
diff --git a/Schemas/visinfo.xsd b/Schemas/visinfo.xsd
index caa53ad..a5a3b5d 100644
--- a/Schemas/visinfo.xsd
+++ b/Schemas/visinfo.xsd
@@ -31,6 +31,13 @@
                         </xs:sequence>
                     </xs:complexType>
                 </xs:element>
+                <xs:element name="Markers" minOccurs="0">
+                    <xs:complexType>
+                        <xs:sequence>
+                            <xs:element name="Marker" type="Marker" minOccurs="0" maxOccurs="unbounded"/>
+                        </xs:sequence>
+                    </xs:complexType>
+                </xs:element>
                 <xs:element name="Bitmaps" minOccurs="0">
                     <xs:complexType>
                         <xs:sequence>
@@ -217,6 +224,11 @@
             <xs:element name="Direction" type="Direction"/>
         </xs:sequence>
     </xs:complexType>
+    <xs:complexType name="Marker">
+        <xs:sequence>
+            <xs:element name="Location" type="Point"/>
+        </xs:sequence>
+    </xs:complexType>
     <xs:complexType name="Bitmap">
         <xs:sequence>
             <xs:element name="Format" type="BitmapFormat"/>