diff --git a/languages.toml b/languages.toml
index 37ed0c49..c552137a 100644
--- a/languages.toml
+++ b/languages.toml
@@ -2249,7 +2249,7 @@ indent = { tab-width = 2, unit = "  " }
 
 [[grammar]]
 name = "diff"
-source = { git = "https://github.com/the-mikedavis/tree-sitter-diff", rev = "fd74c78fa88a20085dbc7bbeaba066f4d1692b63" }
+source = { git = "https://github.com/the-mikedavis/tree-sitter-diff", rev = "2520c3f934b3179bb540d23e0ef45f75304b5fed" }
 
 [[language]]
 name = "git-rebase"
diff --git a/runtime/queries/diff/highlights.scm b/runtime/queries/diff/highlights.scm
index 1c1a8829..0dc483f1 100644
--- a/runtime/queries/diff/highlights.scm
+++ b/runtime/queries/diff/highlights.scm
@@ -4,3 +4,7 @@
 (commit) @constant
 (location) @attribute
 (command) @markup.bold
+
+(comment) @comment
+; Rename/copy similarity percentage (`similarity index 95%`).
+(score) @constant.numeric