diff --git a/README.md b/README.md
index ad605c6..d329ad9 100644
--- a/README.md
+++ b/README.md
@@ -219,6 +219,12 @@ In 3D Tiles 1.1, GPU instancing is supported. This means that the same model can
 https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/EXT_mesh_gpu_instancing/README.md). 
 Files like I3dm/cmpt are no longer created.
 
+Attribute information can be added to the instances using glTF 2.0 extensions 
+
+- EXT_instance_features - https://github.com/CesiumGS/glTF/tree/3d-tiles-next/extensions/2.0/Vendor/EXT_instance_features
+
+- EXT_structural_metadata - https://github.com/CesiumGS/glTF/tree/3d-tiles-next/extensions/2.0/Vendor/EXT_structural_metadata
+
 There is an experimental option to create 3D Tiles 1.1 using GPU instancing: --use_gpu_instancing (default false).
 
 This option is currently in development. 
@@ -231,7 +237,7 @@ https://bertt.github.io/cesium_3dtiles_samples/samples/1.1/grenoble_trees/
 
 The following features should work: 
 
-- Attribute information from tags using EXT_structural_metadata, EXT_mesh_gpu_instancing and EXT_instance_features. 
+- Attribute information from tags; 
 
 - Positioning, Rotation (roll, pitch, yaw) and Scaling of instances.
 
@@ -254,7 +260,7 @@ Known limits:
 
 - No support for multiple meshes/nodes in the input model;
 
-- composite tiles (formerly known as cmpt). When there are multiple models in the input table only the first one is used.
+- composite tiles (formerly known as cmpt). Support is added for multiple models in a tile (like multiple models in a composite cmpt file). There is a known issue with showing the attribute information in Cesium.
 
 Warning: When the input glTF model has transformations, the model will be transformed twice: once in the glTF and once for the instance translations. In some 
 cases it's better to remove the transformations from the input model. For example tool 'gltf-tansform' - function clearNodeTransform (https://gltf-transform.dev/modules/functions/functions/clearNodeTransform) can be 
@@ -286,6 +292,8 @@ To Visualize in CesiumJS, add references to:
 
 ## History
 
+2024-06-20: release 2.7.4: fix for composite tiles when using GPU instancing
+
 2024-06-13: release 2.7.3: add support for other input source EPSG codes than 4326
 
 2024-06-10: release 2.7.2: fix gpu instancing yaw, pitch, roll, remove mapbox code (parameter -f --format)
diff --git a/src/i3dm.export.csproj b/src/i3dm.export.csproj
index e991509..e75c3d1 100644
--- a/src/i3dm.export.csproj
+++ b/src/i3dm.export.csproj
@@ -5,9 +5,9 @@
     <TargetFramework>net6.0</TargetFramework>
 	<ToolCommandName>i3dm.export</ToolCommandName>
 	<PackageOutputPath>./nupkg</PackageOutputPath>
-	<Version>2.7.3</Version>
-	<AssemblyVersion>2.7.3</AssemblyVersion>
-	<FileVersion>2.7.3</FileVersion>
+	<Version>2.7.4</Version>
+	<AssemblyVersion>2.7.4</AssemblyVersion>
+	<FileVersion>2.7.4</FileVersion>
 	<PackageProjectUrl>https://github.com/geodan/i3dm.export</PackageProjectUrl>
 	<RepositoryUrl>https://github.com/geodan/i3dm.export</RepositoryUrl>
 	<RepositoryType>git</RepositoryType>