diff --git a/indexer/feature_data.cpp b/indexer/feature_data.cpp
index 31e5c905ea..57e2a97ca6 100644
--- a/indexer/feature_data.cpp
+++ b/indexer/feature_data.cpp
@@ -13,6 +13,16 @@ TypesHolder::TypesHolder(FeatureBase const & f)
   f.ForEachTypeRef(*this);
 }
 
+string TypesHolder::DebugPrint() const
+{
+  Classificator const & c = classif();
+
+  string s;
+  for (size_t i = 0; i < Size(); ++i)
+    s += c.GetFullObjectName(m_types[i]) + "  ";
+  return s;
+}
+
 void FeatureParamsBase::MakeZero()
 {
   layer = 0;
diff --git a/indexer/feature_data.hpp b/indexer/feature_data.hpp
index 430f396f3e..fe208e6238 100644
--- a/indexer/feature_data.hpp
+++ b/indexer/feature_data.hpp
@@ -88,7 +88,14 @@ namespace feature
       return false;
     }
     //@}
+
+    string DebugPrint() const;
   };
+
+  inline string DebugPrint(TypesHolder const & t)
+  {
+    return t.DebugPrint();
+  }
 }
 
 /// Feature description struct.