diff --git a/package.json b/package.json
index 4a048e0..668b52f 100644
--- a/package.json
+++ b/package.json
@@ -108,6 +108,18 @@
   "author": "Jason Miller <jason@developit.ca>",
   "license": "Apache-2.0",
   "homepage": "https://github.com/developit/htm",
+  "peerDependencies": {
+    "preact": "^10.0.0",
+    "react": "^16.0.0"
+  },
+  "peerDependenciesMeta": {
+    "preact": {
+      "optional": true
+    },
+    "react": {
+      "optional": true
+    }
+  },
   "devDependencies": {
     "@babel/core": "^7.2.2",
     "@babel/preset-env": "^7.1.6",