docs: Expounding upon changeset

.changeset/tiny-garlics-argue.md

@@ -3,4 +3,12 @@
 'create-preact-cli': major
 ---
 
-Extracts project creation functionality from `preact-cli` into a separate package (name tbd)
+Extracts project creation functionality from `preact-cli` into `create-preact-cli`
+
+Setting up new `preact-cli` projects with `npx` is slow, as all dependencies of `preact-cli` would need to be installed, even though only a handful are used for project initialization. On the other hand, suggesting global installs is less than attractive due to NPM's poor default install location (requires `sudo`) and this can get out of sync over time.
+
+By extracting project initialization into its own package, we can provide much, much faster project setup times.
+
+To setup a new project, users will use `npm init preact-cli ...` or `yarn create preact-cli ...`.
+
+Additionally, the `--yarn` flag has been removed in favour of using the yarn initializer (`yarn create`).