diff --git a/vcg/math/histogram.h b/vcg/math/histogram.h
index e0995775..b8b29195 100644
--- a/vcg/math/histogram.h
+++ b/vcg/math/histogram.h
@@ -24,6 +24,10 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.15  2006/11/28 09:47:42  corsini
+add documentation
+fix typo
+
 Revision 1.14  2006/05/04 00:09:53  cignoni
 minor change: removed unused vars
 
@@ -292,6 +296,9 @@ ScalarType Histogram<ScalarType>::Percentile(ScalarType frac) const
 	return R[i+1];
 }
 
+typedef Histogram<double> Histogramd ;
+typedef Histogram<float> Histogramf ;
+
 } // end namespace (vcg)
 
 #endif  /* __VCG_HISTOGRAM */