diff --git a/readme.md b/readme.md
index 02b718f5..b71cc308 100644
--- a/readme.md
+++ b/readme.md
@@ -287,6 +287,8 @@ There are also a few plugins that work in any ecosystem:
   — ignore unrelated messages in GitHub Actions and Travis
 * [`unified-infer-git-meta`](https://github.com/unifiedjs/unified-infer-git-meta)
   — infer metadata of a document from Git
+* [`unified-log-tree`](https://github.com/ipikuka/unified-log-tree)
+  — log abstract syntax trees (ASTs) without mutating for debugging
 * [`unified-message-control`](https://github.com/unifiedjs/unified-message-control)
   — enable, disable, and ignore messages from content