diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 9bf610d..a04a1d8 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -7,4 +7,12 @@ Agreement](./CLA.md) and contributed to `github.com/axonops/syncmap`.
 > by `.github/workflows/contributors.yml` every time a new signature
 > lands. Do not edit it by hand — edits are overwritten.
 
-_No contributors have signed yet. Be the first — open a pull request._
+## Signatories
+
+| Contributor | GitHub | Signed (UTC) | First PR |
+|---|---|---|---|
+| Johnny Miller | [@millerjp](https://github.com/millerjp) | 2026-04-21 | — |
+
+---
+
+_1 contributor so far. Full signature records live in [`signatures/version1/cla.json`](./signatures/version1/cla.json)._
diff --git a/signatures/version1/cla.json b/signatures/version1/cla.json
index 6d978e7..2db7bbe 100644
--- a/signatures/version1/cla.json
+++ b/signatures/version1/cla.json
@@ -1,3 +1,13 @@
 {
-  "signedContributors": []
+  "signedContributors": [
+    {
+      "name": "Johnny Miller",
+      "id": 163300,
+      "comment_id": 0,
+      "created_at": "2026-04-21T07:30:00Z",
+      "repoId": 1215690488,
+      "pullRequestNo": 0,
+      "login": "millerjp"
+    }
+  ]
 }