diff --git a/extension/composer.json b/extension/composer.json
new file mode 100644
index 0000000..eac23d7
--- /dev/null
+++ b/extension/composer.json
@@ -0,0 +1,12 @@
+{
+    "name": "wasm",
+    "description": "Run WebAssembly binaries safely.",
+    "type": "extension",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "Ivan Enderlin",
+            "email": "ivan.enderlin@hoa-project.net"
+        }
+    ]
+}