diff --git a/platform/indexing-api/src/com/intellij/util/indexing/FileBasedIndex.java b/platform/indexing-api/src/com/intellij/util/indexing/FileBasedIndex.java
index 574f78b58297..843d5e17a39c 100644
--- a/platform/indexing-api/src/com/intellij/util/indexing/FileBasedIndex.java
+++ b/platform/indexing-api/src/com/intellij/util/indexing/FileBasedIndex.java
@@ -58,7 +58,10 @@ public abstract class FileBasedIndex {
     throw new IllegalArgumentException("Virtual file doesn't support id: " + file + ", implementation class: " + file.getClass().getName());
   }
 
-  // note: upsource implementation requires access to Project here, please don't remove
+  /**
+   * @deprecated see {@link ManagingFS#findFileById(int)}
+   */ // note: upsource implementation requires access to Project here, please don't remove (not anymore)
+  @Deprecated
   public abstract VirtualFile findFileById(Project project, int id);
 
   public void requestRebuild(@NotNull ID<?, ?> indexId) {