diff --git a/docs/images/zrok_frontends_v0.3.drawio b/docs/images/zrok_frontends_v0.3.drawio
index 8260edc2..562270a3 100755
--- a/docs/images/zrok_frontends_v0.3.drawio
+++ b/docs/images/zrok_frontends_v0.3.drawio
@@ -1 +1 @@
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diff --git a/docs/images/zrok_frontends_v0.3.png b/docs/images/zrok_frontends_v0.3.png
index 2d2c7391..1e681175 100755
Binary files a/docs/images/zrok_frontends_v0.3.png and b/docs/images/zrok_frontends_v0.3.png differ
diff --git a/docs/v0.3_public_private_sharing.md b/docs/v0.3_public_private_sharing.md
index a851b956..cccaa72f 100644
--- a/docs/v0.3_public_private_sharing.md
+++ b/docs/v0.3_public_private_sharing.md
@@ -14,3 +14,18 @@ The `*.in.zrok.io` frontend is a "public" frontend, available to all `zrok` user
 
 The other two "private" frontends are configured with an `environment_id` and no `name` label (the lack of a `name` label signifies that these are "private" frontends). The ephemeral environment is allocated when a `zrok` frontend request is made without an account on behalf of a private share.
 
+## Share Modes
+
+_Note: In `v0.3`, the `tunnel` and `untunnel` concepts get renamed to `share` and `unshare`._
+
+### Public Sharing
+
+In `v0.2`, `zrok` only offered a "public" sharing mode. The public sharing mode will allow any configured `frontend` instances to send traffic to any `backend`. The policy and permission model was very simple and flat. A `v0.2` deployment considers any available `frontend` instance to be allowed to send traffic to configured services. The frontends are controlled by identity within the underlying Ziti network.
+
+In `v0.3`, `zrok` will offer both a "public" and a "private" sharing mode. When `v0.3` configures the policies for a service, a publicly-shared service will have policies created that allow whichever selected public `frontend` instances to access the shared `backend`. A `v0.3` deployment will have a collection of multi-tenant, high-capacity `frontend` instances available to be selected from. The `zrok` CLI will default to selecting the `public` `frontend` instances.
+
+### Private Sharing
+
+`v0.3` introduces a "private" sharing mode. When provisioning a service for private sharing, `zrok` will not create any policies for the service, until a request for a frontend binding is created for the service (through the `zrok serve` command).
+
+The `v0.3` `zrok` service will support both identified users (the `zrok` user has a provisioned `environment`), as well as ephemeral users (the `zrok` controller will create an "ephemeral environment" for these users).