diff --git a/.github/funding.yml b/.github/funding.yml
index 1a630e9..1524d5d 100644
--- a/.github/funding.yml
+++ b/.github/funding.yml
@@ -1,3 +1,4 @@
 github: sindresorhus
 open_collective: sindresorhus
 custom: https://sindresorhus.com/donate
+tidelift: npm/is-observable
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 d105e61..7acf015 100644
--- a/readme.md
+++ b/readme.md
@@ -23,3 +23,16 @@ isObservable(Observable.of(1, 2));
 ## Related
 
 - [observable-to-promise](https://github.com/sindresorhus/observable-to-promise) - Convert an Observable to a Promise
+
+
+---
+
+<div align="center">
+	<b>
+		<a href="https://tidelift.com/subscription/pkg/npm-is-observable?utm_source=npm-is-observable&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>