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diff --git a/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cityblock_distance_f64.c b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cityblock_distance_f64.c
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index 0000000..46c0a6d
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+++ b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cityblock_distance_f64.c
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+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cityblock_distance_f64.c
+ * Description:  Cityblock (Manhattan) distance between two vectors
+ *
+ * $Date:        13 September 2021
+ * $Revision:    V1.10.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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.
+ */
+
+#include "dsp/distance_functions.h"
+#include <limits.h>
+#include <math.h>
+
+/**
+  @addtogroup Manhattan
+  @{
+ */
+
+
+/**
+ * @brief        Cityblock (Manhattan) distance between two vectors
+ * @param[in]    pA         First vector
+ * @param[in]    pB         Second vector
+ * @param[in]    blockSize  vector length
+ * @return distance
+ *
+ */
+float64_t arm_cityblock_distance_f64(const float64_t *pA,const float64_t *pB, uint32_t blockSize)
+{
+   float64_t accum,tmpA, tmpB;
+
+   accum = 0.;
+   while(blockSize > 0)
+   {
+      tmpA = *pA++;
+      tmpB = *pB++;
+      accum  += fabs(tmpA - tmpB);
+      
+      blockSize --;
+   }
+  
+   return(accum);
+}
+
+/**
+ * @} end of Manhattan group
+ */