diff --git a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/LineMarkersPass.java b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/LineMarkersPass.java
index a3cc9ebfbea6..35ee763e4234 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/LineMarkersPass.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/LineMarkersPass.java
@@ -111,6 +111,9 @@ public class LineMarkersPass extends TextEditorHighlightingPass implements LineM
     }
 
     myMarkers = mergeLineMarkers(lineMarkers, myEditor);
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("LineMarkersPass.doCollectInformation. lineMarkers: " + lineMarkers+"; merged: "+myMarkers);
+    }
   }
 
   @NotNull