diff --git a/_data/releases/releases.yml b/_data/releases/releases.yml
index 0478c0d2..d7cc99e0 100644
--- a/_data/releases/releases.yml
+++ b/_data/releases/releases.yml
@@ -4,6 +4,9 @@
 - title: 0.2.0
   date: 2020-08-20
   desc: Release of the CASE ontology with an encoded relationship with UCO. Removed prototype file, imported UCO, and provided investigation namespace.
+- title: 0.2.1
+  date: TBD
+  desc: Implementation of owl:versionIRI, and adoption of UCO 0.4.1 that does the same atop UCO 0.4.0.
 - title: 0.3.0
   date: 2021-03-19
   desc: Adoption of UCO 0.5.0. Added inline documentation, improved ontology release engineering process, and adjusted role modeling.
diff --git a/releases/0.2.1/index.md b/releases/0.2.1/index.md
new file mode 100644
index 00000000..55078020
--- /dev/null
+++ b/releases/0.2.1/index.md
@@ -0,0 +1,52 @@
+---
+title: 0.2.1 Release
+layout: releases
+custom_css: releases
+---
+
+# {{ page.title }}
+
+*Date: TBD*
+
+## Ontology File(s)
+
+[GitHub](https://github.com/casework/CASE/releases/tag/0.2.1)
+
+## Migration guidance
+
+In terms of CASE-namespaced concepts, release 0.2.1 is a patch to 0.2.0.  Migration from CASE 0.2.0 does not require alterations to existing data, except that ontology prefixes will now encode the ontology version in the concept IRI.
+
+## Release Notes
+
+### Focus
+
+The focus of this patch is on IRI's:
+* slash based as opposed to #-based IRI's
+
+
+### Changes
+
+*(These are changes to ontologies, classes or properties in the preexisting ontology.)*
+
+Throughout this section, many of the notes are tied to Change Proposals.  These proposals are available on CASE's [Reference Material page](/resources/references.html).
+
+#### Development Changes
+
+*(These are changes to ontology development practice, and are not necessarily changes to ontology data.)*
+
+* None
+
+#### Breaking Changes
+
+*(These are changes to ontologies, classes or properties in the preexisting ontology that make the new release non-backward-compatible.)*
+
+* None
+
+
+#### Changes
+
+*(These are general changes to the preexisting ontology that are not breaking or range changes.)*
+
+* rdf-toolkit base-iri flag degenerates versionIRI when slash IRI form is used
+  *([Change Proposal 38](https://drive.google.com/file/d/1T7ZmDZuslKAGc2HA3PPYhSmKqDDoqfkt/view))* 
+