diff --git a/Makefile b/Makefile
index 3936460b..a67f4342 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,25 @@
 .PHONY: build-keria
-build-keria:
-	@docker buildx build --platform=linux/amd64 --no-cache -f images/keria.dockerfile --tag weboftrust/keria:0.2.0-rc1 .
+
+VERSION=0.2.0-rc1
+
+define DOCKER_WARNING
+In order to use the multi-platform build enable the containerd image store
+The containerd image store is not enabled by default.
+To enable the feature for Docker Desktop:
+	Navigate to Settings in Docker Desktop.
+	In the General tab, check Use containerd for pulling and storing images.
+	Select Apply and Restart."
+endef
+
+build-keria: .warn
+	@docker build --platform=linux/amd64,linux/arm64 --no-cache -f images/keria.dockerfile -t weboftrust/keria:$(VERSION) .
 
 publish-keria:
-	@docker push weboftrust/keria --all-tags
\ No newline at end of file
+	@docker push weboftrust/keria:$(VERSION)
+
+.warn:
+	@echo -e ${RED}"$$DOCKER_WARNING"${NO_COLOUR}
+
+RED="\033[0;31m"
+NO_COLOUR="\033[0m"
+export DOCKER_WARNING
diff --git a/README.md b/README.md
index 482f9c4b..d06afe5a 100644
--- a/README.md
+++ b/README.md
@@ -84,3 +84,18 @@ You can see a [working example here](https://github.com/WebOfTrust/signify-ts/bl
     ```bash
       pytest tests/
     ```
+
+## Publishing containers
+
+Enable the containerd image store
+
+The containerd image store isn't enabled by default. To enable the feature for Docker Desktop:
+
+Navigate to Settings in Docker Desktop.
+In the General tab, check Use containerd for pulling and storing images.
+Select Apply & Restart.
+
+```shell
+make build-keri
+make publish-keri
+```
\ No newline at end of file
diff --git a/src/keria/app/agenting.py b/src/keria/app/agenting.py
index 7876073b..9ecdc1cf 100644
--- a/src/keria/app/agenting.py
+++ b/src/keria/app/agenting.py
@@ -890,8 +890,8 @@ def on_post(self, req, rep):
         caid = icp.pre
 
         if self.agency.get(caid=caid) is not None:
-            raise falcon.HTTPBadRequest(title="agent already exists",
-                                        description=f"agent for controller {caid} already exists")
+            raise falcon.HTTPConflict(title="agent already exists",
+                                      description=f"agent for controller {caid} already exists")
 
         agent = self.agency.create(caid=caid)
 
diff --git a/tests/app/test_agenting.py b/tests/app/test_agenting.py
index 2a31c2c5..c6ef6593 100644
--- a/tests/app/test_agenting.py
+++ b/tests/app/test_agenting.py
@@ -224,7 +224,7 @@ def test_boot_ends(helpers):
     assert rep.status_code == 202
 
     rep = client.simulate_post("/boot", body=json.dumps(body).encode("utf-8"))
-    assert rep.status_code == 400
+    assert rep.status_code == 409
     assert rep.json == {
         'title': 'agent already exists',
         'description': 'agent for controller EK35JRNdfVkO4JwhXaSTdV4qzB_ibk_tGJmSVcY4pZqx already exists'