diff --git a/doc/source/ObiDMS_ULM.class.violet.html b/doc/source/ObiDMS_ULM.class.violet.html
new file mode 100644
index 0000000..561f7af
--- /dev/null
+++ b/doc/source/ObiDMS_ULM.class.violet.html
@@ -0,0 +1,1664 @@
+
+
+
+
+
+
+
+
+ This file was generated with Violet UML Editor 2.1.0.
+ ( View Source / Download Violet )
+
+
+
+
+
+ 
+
+
\ No newline at end of file
diff --git a/doc/source/formats.rst b/doc/source/formats.rst
index 61e6ddf..4f8aa45 100644
--- a/doc/source/formats.rst
+++ b/doc/source/formats.rst
@@ -88,6 +88,13 @@ of each mandatory column. Only one version of each column is included. All the c
one view contain the same number of lines in the same order.
+OBIDMS ULM
+==========
+
+.. image:: ./images/OBIDMS_ULM.png
+:download:`html version of the OBIDMS ULM file `
+
+
OBIIntColumn header file
========================
diff --git a/doc/source/images/OBIDMS_ULM.png b/doc/source/images/OBIDMS_ULM.png
new file mode 100644
index 0000000..c32e0e5
Binary files /dev/null and b/doc/source/images/OBIDMS_ULM.png differ