diff --git a/packages/ckeditor5-admonition/src/admonitionautoformat.ts b/packages/ckeditor5-admonition/src/admonitionautoformat.ts
index 28172f5a1..ab0191e8c 100644
--- a/packages/ckeditor5-admonition/src/admonitionautoformat.ts
+++ b/packages/ckeditor5-admonition/src/admonitionautoformat.ts
@@ -1,6 +1,17 @@
 import Plugin from "@ckeditor/ckeditor5-core/src/plugin";
 import Autoformat from "@ckeditor/ckeditor5-autoformat/src/autoformat";
 import blockAutoformatEditing from "@ckeditor/ckeditor5-autoformat/src/blockautoformatediting";
+import { AdmonitionType, admonitionTypes } from "./admonitioncommand";
+
+function tryParseAdmonitionType(match: RegExpMatchArray) {
+	if (match.length !== 2) {
+		return;
+	}
+
+	if ((admonitionTypes as readonly string[]).includes(match[1])) {
+		return match[1] as AdmonitionType;
+	}
+}
 
 export default class AdmonitionAutoformat extends Plugin {
 	static get requires() {
@@ -13,8 +24,13 @@ export default class AdmonitionAutoformat extends Plugin {
 		}
 
 		const instance = (this as any);
-		blockAutoformatEditing(this.editor, instance, /^\!\!\[*\! (.+) $/, (match) => {
-			console.log("Got match ", match);
+		blockAutoformatEditing(this.editor, instance, /^\!\!\[*\! (.+) $/, ({ match }) => {
+			const type = tryParseAdmonitionType(match);
+			if (!type) {
+				return;
+			}
+
+			this.editor.execute("admonition", { forceValue: type });
 		});
 	}
 }
diff --git a/packages/ckeditor5-admonition/src/admonitioncommand.ts b/packages/ckeditor5-admonition/src/admonitioncommand.ts
index 798aef5ba..dd78bdb6e 100644
--- a/packages/ckeditor5-admonition/src/admonitioncommand.ts
+++ b/packages/ckeditor5-admonition/src/admonitioncommand.ts
@@ -17,8 +17,8 @@ import type { DocumentFragment, Element, Position, Range, Schema, Writer } from
  * @extends module:core/command~Command
  */
 
-// TODO: Change me.
-type AdmonitionType = string;
+export const admonitionTypes = [ "note", "tip", "important", "caution", "warning" ] as const;
+export type AdmonitionType = typeof admonitionTypes[number];
 
 interface ExecuteOpts {
 	/**
@@ -118,7 +118,7 @@ export default class AdmonitionCommand extends Command {
 		// In the current implementation, the admonition must be an immediate parent of a block element.
 		const firstQuote = findQuote( firstBlock );
 		if (firstQuote?.is("element")) {
-			return firstQuote.getAttribute("type") as string;
+			return firstQuote.getAttribute("type") as AdmonitionType;
 		}
 
 		return false;
diff --git a/packages/ckeditor5-admonition/src/admonitionui.ts b/packages/ckeditor5-admonition/src/admonitionui.ts
index c81a37a28..6e5b779fe 100644
--- a/packages/ckeditor5-admonition/src/admonitionui.ts
+++ b/packages/ckeditor5-admonition/src/admonitionui.ts
@@ -13,26 +13,26 @@ import { addListToDropdown, createDropdown, ListDropdownButtonDefinition, SplitB
 import '../theme/blockquote.css';
 import admonitionIcon from '../theme/icons/admonition.svg';
 import { Collection } from '@ckeditor/ckeditor5-utils';
-import AdmonitionCommand from './admonitioncommand';
+import AdmonitionCommand, { AdmonitionType } from './admonitioncommand';
 
 interface AdmonitionDefinition {
 	title: string;
 }
 
-export const ADMONITION_TYPES: Record<string, AdmonitionDefinition> = {
-	"note": {
+export const ADMONITION_TYPES: Record<AdmonitionType, AdmonitionDefinition> = {
+	note: {
 		title: "Note"
 	},
-	"tip": {
+	tip: {
 		title: "Tip"
 	},
-	"important": {
+	important: {
 		title: "Important"
 	},
-	"caution": {
+	caution: {
 		title: "Caution"
 	},
-	"warning": {
+	warning: {
 		title: "Warning"
 	}
 };