diff --git a/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollector.java b/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollector.java
index 87b88f7d816a..c5421ba8c12b 100644
--- a/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollector.java
+++ b/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollector.java
@@ -30,6 +30,9 @@ public abstract class FileBasedIndexScanRunnableCollector {
     return ServiceManager.getService(project, FileBasedIndexScanRunnableCollector.class);
   }
 
-  public abstract Boolean shouldCollect(@NotNull final VirtualFile file);
+  // Returns true if file should be indexed
+  public abstract boolean shouldCollect(@NotNull final VirtualFile file);
+
+  // Collect all roots for indexing
   public abstract List<Runnable> collectScanRootRunnables(@NotNull final ContentIterator processor, final ProgressIndicator indicator);
 }
diff --git a/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollectorImpl.java b/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollectorImpl.java
index 8e38cc46a5c4..34e01af60a9b 100644
--- a/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollectorImpl.java
+++ b/platform/lang-impl/src/com/intellij/util/indexing/FileBasedIndexScanRunnableCollectorImpl.java
@@ -44,7 +44,7 @@ public class FileBasedIndexScanRunnableCollectorImpl extends FileBasedIndexScanR
   }
 
   @Override
-  public Boolean shouldCollect(@NotNull VirtualFile file) {
+  public boolean shouldCollect(@NotNull VirtualFile file) {
     if (myProjectFileIndex.isInContent(file) || myProjectFileIndex.isInLibraryClasses(file) || myProjectFileIndex.isInLibrarySource(file)) {
       return !myFileTypeManager.isFileIgnored(file);
     }