diff --git a/src/Tree.cpp b/src/Tree.cpp
index c8c5ea1a7..8529ca848 100644
--- a/src/Tree.cpp
+++ b/src/Tree.cpp
@@ -190,6 +190,12 @@ void Tree::unTag (const std::string& tag)
   }
 }
 
+////////////////////////////////////////////////////////////////////////////////
+int Tree::countTags () const
+{
+  return _tags.size ();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int Tree::count () const
 {
diff --git a/src/Tree.h b/src/Tree.h
index c517ce2d5..43205743e 100644
--- a/src/Tree.h
+++ b/src/Tree.h
@@ -56,6 +56,7 @@ public:
   bool hasTag (const std::string&) const;
   void tag (const std::string&);
   void unTag (const std::string&);
+  int countTags () const;
 
   int count () const;