diff --git a/.github/funding.yml b/.github/funding.yml
index 0038dab..226bf96 100644
--- a/.github/funding.yml
+++ b/.github/funding.yml
@@ -1 +1,2 @@
 github: sindresorhus
+tidelift: npm/@sindresorhus/is
diff --git a/.github/security.md b/.github/security.md
new file mode 100644
index 0000000..5358dc5
--- /dev/null
+++ b/.github/security.md
@@ -0,0 +1,3 @@
+# Security Policy
+
+To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
diff --git a/readme.md b/readme.md
index 157ac8a..052f565 100644
--- a/readme.md
+++ b/readme.md
@@ -463,3 +463,16 @@ The most common mistakes I noticed in these modules was using `instanceof` for t
 - [Sindre Sorhus](https://github.com/sindresorhus)
 - [Giora Guttsait](https://github.com/gioragutt)
 - [Brandon Smith](https://github.com/brandon93s)
+
+
+---
+
+<div align="center">
+	<b>
+		<a href="https://tidelift.com/subscription/pkg/npm--sindresorhus-is?utm_source=npm--sindresorhus-is&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
+	</b>
+	<br>
+	<sub>
+		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
+	</sub>
+</div>