diff --git a/document/_java.learnMoreAboutCleanUps.md b/document/_java.learnMoreAboutCleanUps.md
index a6b8e3cbd..36d74d746 100644
--- a/document/_java.learnMoreAboutCleanUps.md
+++ b/document/_java.learnMoreAboutCleanUps.md
@@ -405,4 +405,30 @@ public class A {
         Parser a12;
     }
 }
+```
+
+### `removeUnusedLambdaParameters`
+
+Rename unused lambda parameters, or unused pattern variables to `_`.
+
+For example:
+
+```java
+J j = (a, b) -> System.out.println(a);
+
+switch (r) {
+    case R(_, long l) -> {}
+    case R r2 -> {}
+}
+```
+
+becomes:
+
+```java
+J j = (a, _) -> System.out.println(a);
+
+switch (r) {
+    case R(_, _) -> {}
+    case R _ -> {}
+}
 ```
\ No newline at end of file
diff --git a/package.json b/package.json
index f702896ca..8fbaabe8b 100644
--- a/package.json
+++ b/package.json
@@ -1313,7 +1313,8 @@
                 "switchExpression",
                 "tryWithResource",
                 "renameFileToType",
-                "organizeImports"
+                "organizeImports",
+                "removeUnusedLambdaParameters"
               ]
             },
             "default": [