diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000000000000000000000000000000000000..6db6bee3ef718b6c3d9e93e49f5c26c9e419d58c
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+++ b/composer.json
@@ -0,0 +1,18 @@
+{
+    "name": "rattail/posterior",
+    "description": "Tailbone API Client",
+    "homepage": "https://rattailproject.org",
+    "license": "GPL-3.0-or-later",
+    "autoload": {
+        "psr-4": {
+            "Rattail\\Posterior\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Lance Edgar",
+            "email": "lance@edbob.org"
+        }
+    ],
+    "require": {}
+}