diff --git a/README.md b/README.md
index f25f535..cd5f743 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,8 @@ compressed.
 
 ## How to use
 
+**`itty-compression` directly depends on Node's zlib via importing `node:zlib`.**
+
 Install with `npm install @major-tanya/itty-compression` (or your favoured alternative to npm).
 
 Once installed, pick your compression algorithm, or use the flexible `negotiatedCompression` middleware.
diff --git a/package-lock.json b/package-lock.json
index a61c885..42921b7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@major-tanya/itty-compression",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@major-tanya/itty-compression",
-      "version": "0.1.0",
+      "version": "0.1.1",
       "license": "MIT",
       "devDependencies": {
         "@rollup/plugin-node-resolve": "^15.2.3",
@@ -31,6 +31,9 @@
         "tslib": "^2.6.2",
         "typescript": "^5.2.2",
         "vitest": "^0.34.6"
+      },
+      "engines": {
+        "node": ">=18"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
diff --git a/package.json b/package.json
index 8914f40..980be68 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@major-tanya/itty-compression",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "main": "./dist/index.js",
   "module": "./dist/index.mjs",
   "types": "./dist/index.d.ts",
@@ -34,6 +34,9 @@
     "url": "https://github.com/MajorTanya/itty-compression/issues"
   },
   "homepage": "https://github.com/MajorTanya/itty-compression#readme",
+  "engines": {
+    "node": ">=18"
+  },
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-terser": "^0.4.4",