diff --git a/documentation/source/library_reference.rst b/documentation/source/library_reference.rst
index a35f03792e..8fcd71a67c 100644
--- a/documentation/source/library_reference.rst
+++ b/documentation/source/library_reference.rst
@@ -79,6 +79,8 @@ as the types used by cocotb's `simulator handles <#simulation-object-handles>`_.
     :members:
     :exclude-members: count, index
 
+.. autofunction:: cocotb.types.concat
+
 .. autoclass:: cocotb.types.Array
     :members:
     :exclude-members: count, index