Add more detail

Signed-off-by: Zahari Dichev <[email protected]>

Author: zaharidichev

CHANGES.md

@@ -2,7 +2,11 @@
 
 ## edge-20.7.4
 
-This edge release brings support for EndpointSlices.
+This edge release adds support for the new Kubernetes [EndpointSlice] resource
+to the Destination controller. Using the EndpointSlice API is more efficient
+for the Kubernetes control plane than using the Endpoints API. If the cluster
+supports EndpointSlices (a beta feature in Kubernetes 1.17), Linkerd can be
+installed with `--enable-endpoint-slices` flag.
 
 * Added fish shell completions to the `linkerd` command (thanks @WLun001!)
 * Enabled the support for EndpointSlices (thanks @Matei207!)