diff --git a/lib/ungrammar/README.md b/lib/ungrammar/README.md
index a0990d747b..b5a3f48ab3 100644
--- a/lib/ungrammar/README.md
+++ b/lib/ungrammar/README.md
@@ -1,6 +1,6 @@
 # ungrammar
 
-A DSL for specifying concrete syntax tree. See this
+A DSL for specifying concrete syntax trees. See this
 [introductory post](https://rust-analyzer.github.io/blog/2020/10/24/introducing-ungrammar.html).
 
 See [./rust.ungram](./rust.ungram) for an example.