diff --git a/platform/util/src/org/jetbrains/annotations/ReadOnly.java b/platform/util/src/org/jetbrains/annotations/ReadOnly.java
index 29bb4b380876..33eddcbf0861 100644
--- a/platform/util/src/org/jetbrains/annotations/ReadOnly.java
+++ b/platform/util/src/org/jetbrains/annotations/ReadOnly.java
@@ -28,7 +28,7 @@ import java.lang.annotation.*;
  */
 @Documented
 @Retention(RetentionPolicy.CLASS)
-@Target({ElementType.METHOD, ElementType.FIELD, ElementType.LOCAL_VARIABLE})
+@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
 @ApiStatus.Experimental
 public @interface ReadOnly {
 }
\ No newline at end of file