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diff --git a/jni/feature_stab/db_vlvm/db_utilities_algebra.h b/jni/feature_stab/db_vlvm/db_utilities_algebra.h
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+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id: db_utilities_algebra.h,v 1.3 2011/06/17 14:03:31 mbansal Exp $ */
+
+#ifndef DB_UTILITIES_ALGEBRA
+#define DB_UTILITIES_ALGEBRA
+
+#include "db_utilities.h"
+
+
+
+/*****************************************************************
+*    Lean and mean begins here                                   *
+*****************************************************************/
+/*!
+ * \defgroup LMAlgebra (LM) Algebra utilities
+ */
+/*\{*/
+
+inline void db_HomogenousNormalize3(double *x)
+{
+    db_MultiplyScalar3(x,db_SafeSqrtReciprocal(db_SquareSum3(x)));
+}
+
+/*\}*/
+
+#endif /* DB_UTILITIES_ALGEBRA */