diff --git a/.gitignore b/.gitignore
index 501cab1..63cb2a5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,5 +2,6 @@ node_modules/
 
 /coverage/
 /dist/
+/docs/
 
 *.log
diff --git a/package.json b/package.json
index ee7b899..18ac5de 100644
--- a/package.json
+++ b/package.json
@@ -98,7 +98,11 @@
     "rollup-plugin-dts": "5.2.0",
     "semantic-release": "20.1.0",
     "ts-node": "10.9.1",
+    "typedoc": "^0.23.25",
     "typescript": "4.9.5"
   },
+  "peerDependencies": {
+    "typedoc": "^0.23.25"
+  },
   "packageManager": "pnpm@7.27.0"
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 3b42d7a..d997a07 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -48,6 +48,7 @@ specifiers:
   rollup-plugin-dts: 5.2.0
   semantic-release: 20.1.0
   ts-node: 10.9.1
+  typedoc: ^0.23.25
   typescript: 4.9.5
 
 devDependencies:
@@ -98,6 +99,7 @@ devDependencies:
   rollup-plugin-dts: 5.2.0_vi3xdhr63abcxdtwtptol35g5u
   semantic-release: 20.1.0
   ts-node: 10.9.1_5lyanyhwyggrikgtn7dsw3wuei
+  typedoc: 0.23.25_typescript@4.9.5
   typescript: 4.9.5
 
 packages:
@@ -1585,6 +1587,10 @@ packages:
     engines: {node: '>=12'}
     dev: true
 
+  /ansi-sequence-parser/1.1.0:
+    resolution: {integrity: sha512-lEm8mt52to2fT8GhciPCGeCXACSz2UwIN4X2e2LJSnZ5uAbn2/dsYdOmUXq0AtWS5cpAupysIneExOgH0Vd2TQ==}
+    dev: true
+
   /ansi-styles/3.2.1:
     resolution: {integrity: sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==}
     engines: {node: '>=4'}
@@ -4787,6 +4793,10 @@ packages:
     engines: {node: '>=12'}
     dev: true
 
+  /lunr/2.3.9:
+    resolution: {integrity: sha512-zTU3DaZaF3Rt9rhN3uBMGQD3dD2/vFQqnvZCDv4dl5iOzq2IZQqTxu90r4E5J+nP70J3ilqVCrbho2eWaeW8Ow==}
+    dev: true
+
   /magic-string/0.16.0:
     resolution: {integrity: sha512-c4BEos3y6G2qO0B9X7K0FVLOPT9uGrjYwYRLFmDqyl5YMboUviyecnXWp94fJTSMwPw2/sf+CEYt5AGpmklkkQ==}
     dependencies:
@@ -6174,6 +6184,15 @@ packages:
     resolution: {integrity: sha512-lT297f1WLAdq0A4O+AknIFRP6kkiI3s8C913eJ0XqBxJbZPGWUNkRQk2u8zk4bEAjUJ5i+fSLwB6z1HzeT+DEg==}
     dev: true
 
+  /shiki/0.14.1:
+    resolution: {integrity: sha512-+Jz4nBkCBe0mEDqo1eKRcCdjRtrCjozmcbTUjbPTX7OOJfEbTZzlUWlZtGe3Gb5oV1/jnojhG//YZc3rs9zSEw==}
+    dependencies:
+      ansi-sequence-parser: 1.1.0
+      jsonc-parser: 3.2.0
+      vscode-oniguruma: 1.7.0
+      vscode-textmate: 8.0.0
+    dev: true
+
   /side-channel/1.0.4:
     resolution: {integrity: sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==}
     dependencies:
@@ -6745,6 +6764,20 @@ packages:
       is-typedarray: 1.0.0
     dev: true
 
+  /typedoc/0.23.25_typescript@4.9.5:
+    resolution: {integrity: sha512-O1he153qVyoCgJYSvIyY3bPP1wAJTegZfa6tL3APinSZhJOf8CSd8F/21M6ex8pUY/fuY6n0jAsT4fIuMGA6sA==}
+    engines: {node: '>= 14.14'}
+    hasBin: true
+    peerDependencies:
+      typescript: 4.6.x || 4.7.x || 4.8.x || 4.9.x
+    dependencies:
+      lunr: 2.3.9
+      marked: 4.2.12
+      minimatch: 6.2.0
+      shiki: 0.14.1
+      typescript: 4.9.5
+    dev: true
+
   /typescript/4.9.5:
     resolution: {integrity: sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==}
     engines: {node: '>=4.2.0'}
@@ -6842,6 +6875,14 @@ packages:
     resolution: {integrity: sha512-1bonkGqQs5/fxGT5UchTgjGVnfysL0O8v1AYMBjqTbWQTFn721zaPGDYFkOKtfDgFiSgXM3KwaG3FMGfW4Ed9Q==}
     dev: true
 
+  /vscode-oniguruma/1.7.0:
+    resolution: {integrity: sha512-L9WMGRfrjOhgHSdOYgCt/yRMsXzLDJSL7BPrOZt73gU0iWO4mpqzqQzOz5srxqTvMBaR0XZTSrVWo4j55Rc6cA==}
+    dev: true
+
+  /vscode-textmate/8.0.0:
+    resolution: {integrity: sha512-AFbieoL7a5LMqcnOF04ji+rpXadgOXnZsxQr//r83kLPr7biP7am3g9zbaZIaBGwBRWeSvoMD4mgPdX3e4NWBg==}
+    dev: true
+
   /vscode-uri/3.0.7:
     resolution: {integrity: sha512-eOpPHogvorZRobNqJGhapa0JdwaxpjVvyBp0QIUMRMSf8ZAlqOdEquKuRmw9Qwu0qXtJIWqFtMkmvJjUZmMjVA==}
     dev: true
diff --git a/src/index.ts b/src/index.ts
index d4a9007..40c3afc 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,99 @@
-/* eslint-disable eslint-comments/disable-enable-pair */
-/* eslint-disable unicorn/no-empty-file */
+import type { Application, ProjectReflection, Reflection } from "typedoc";
+import { ParameterType, Validator, ReflectionKind } from "typedoc";
 
-// Write me
+/**
+ * Extend typedoc's options with the plugin's option using declaration merging.
+ */
+declare module "typedoc" {
+  // eslint-disable-next-line @typescript-eslint/consistent-type-definitions, jsdoc/require-jsdoc
+  export interface TypeDocOptionMap {
+    requireTags: {
+      byKind: ByKindEntry[];
+    };
+  }
+}
+
+export type ByKindEntry = {
+  kind: keyof typeof ReflectionKind;
+  tags: string[];
+};
+
+export function load(app: Readonly<Application>) {
+  // @ts-expect-error -- FIXME: ???
+  app.options.addDeclaration({
+    name: "requireTags",
+    help: "The configuration object of the require-tags plugin.",
+    type: ParameterType.Object,
+  });
+
+  app.validator.on(
+    Validator.EVENT_RUN,
+    (project: Readonly<ProjectReflection>) => {
+      const requireTagsOptions = app.options.getValue(
+        "requireTags"
+      ) as unknown as {
+        byKind: ByKindEntry[];
+      };
+
+      let m_kinds = requireTagsOptions.byKind.reduce(
+        (prev, cur) => prev | ReflectionKind[cur.kind],
+        0
+      );
+
+      const reflectionKindReplacements: Array<
+        [oldKind: number, newKind: number]
+      > = [
+        [ReflectionKind.FunctionOrMethod, ReflectionKind.CallSignature],
+        [ReflectionKind.Constructor, ReflectionKind.ConstructorSignature],
+        [
+          ReflectionKind.Accessor,
+          ReflectionKind.GetSignature | ReflectionKind.SetSignature,
+        ],
+      ];
+
+      for (const [oldKind, newKind] of reflectionKindReplacements) {
+        m_kinds = (m_kinds | newKind) & ~oldKind;
+      }
+
+      const requireTagsByKind = new Map<number, string[]>(
+        requireTagsOptions.byKind.map(
+          ({ kind: kindString, tags }): [number, string[]] => {
+            const kind = ReflectionKind[kindString];
+            const realKind =
+              reflectionKindReplacements.find(
+                ([oldKind]) => (oldKind & kind) !== 0
+              )?.[1] ?? kind;
+            return [realKind, tags];
+          }
+        )
+      );
+
+      const reflections = project.getReflectionsByKind(m_kinds);
+      const seen = new Set<Reflection>();
+
+      for (const reflection of reflections) {
+        if (seen.has(reflection)) {
+          continue;
+        }
+
+        seen.add(reflection);
+
+        if (!reflection.hasComment()) {
+          app.logger.warn(
+            `${reflection.getFriendlyFullName()} does not have any documentation.`
+          );
+          continue;
+        }
+
+        for (const tagName of requireTagsByKind.get(reflection.kind)!) {
+          const tag = `@${tagName}` as const;
+          if (reflection.comment!.getTags(tag).length === 0) {
+            app.logger.warn(
+              `${reflection.getFriendlyFullName()} does not have any ${tag} tags.`
+            );
+          }
+        }
+      }
+    }
+  );
+}