diff --git a/README.md b/README.md
index fabc077..1b58303 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ Installation
 ------------
 
 -   Note: It is not necessary to install scATAC-pro from scratch. You can use the docker or singularity version if you prefer (see [Run scATAC-pro through docker or singularity](#run-scATAC-pro-through-docker-or-singularity) )
--   Run the following command in your terminal, scATAC-pro will be installed in YOUR\_INSTALL\_PATH/scATAC-pro\_1.4.0
+-   Run the following command in your terminal, scATAC-pro will be installed in YOUR\_INSTALL\_PATH/scATAC-pro\_1.4.1
 
 <!-- -->
 
@@ -49,7 +49,7 @@ Installation
 Updates
 ------------
 - Now provide [scATAC-pro tutorial in R](https://scatacpro-in-r.netlify.app/index.html) for access QC metrics and perform downstream analysis
-- Current version: 1.4.0
+- Current version: 1.4.1
 - Recent updates
     * *labelTransfer*: new module added, to do label trasfer (for cell annotation) from cell annotation of scRNA-seq data. First construct a gene by cell activity matrix, then use *FindTransferAnchors* and *TransferData* function from Seurat R package to predicted cell type annotation from the cell annotaiton in scRNA-seq data.
     * *rmDoublets*: new module added, to remove potential doublets using [DoubletFinder](https://github.com/chris-mcginnis-ucsf/DoubletFinder) algorithm.
@@ -297,11 +297,13 @@ cello('output/downstream_analysis/PEAK_CALLER/CELL_CALLER/VisCello_obj') ## laun
 Detailed Usage
 --------------
 
+See [here](https://scatacpro-in-r.netlify.app/note_module) or in your terminal:
+
     $ scATAC-pro --help
     usage : scATAC-pro -s STEP -i INPUT -c CONFIG [-o] [-h] [-v]
     Use option -h|--help for more information
 
-    scATAC-pro 1.4.0
+    scATAC-pro 1.4.1
     ---------------
     OPTIONS
 
@@ -445,7 +447,7 @@ Detailed Usage
                          output: a updated seurat object for atac with the Predicted_Cell_Type as a metadata variable and
                                  an umap plot colored by Predicted_Cell_Type, saved in the same directory as the input atac
                                  seurat object.
-                         *Note*: the cell annotation should be given as a metadata of the seurat object of
+                         NOTE: the cell annotation should be given as a metadata of the seurat object of
                                scRNA-seq. Both seurat objects should have pca and umap dimemsion reduction 
                                done.
         
diff --git a/complete_update_history.md b/complete_update_history.md
index 2119089..5f38742 100644
--- a/complete_update_history.md
+++ b/complete_update_history.md
@@ -1,4 +1,9 @@
 ## Complete Update History
+- Version 1.4.1 released
+    * update tutorial
+    * correct a bug relate to input filepath for report module 
+    * record input file paths for the *integration* module
+    * using BAMPE for macs2 for paired-end sequencing
 - Version 1.4.0 released 
     * new module added: labelTransfer (for cell annotation) from scRNA-seq
 - Version 1.3.1 released
diff --git a/configure_user.txt b/configure_user.txt
index a5cbe84..94a89f0 100644
--- a/configure_user.txt
+++ b/configure_user.txt
@@ -64,7 +64,7 @@ PEAK_CALLER = MACS2  ## one of MACS2, BIN, and COMBINED
 
 ## provided extra options for macs2 (NO NEED TO SPECIFY -t, -n, -f here), like
 
-#MACS2_OPTS = -q 0.05 -g hs 
+#MACS2_OPTS = -q 0.05 -g hs  
 ## (change to -g mm if you are using mouse data) 
 
 ## or something like this to ignore building shifting model 
diff --git a/scATAC-pro b/scATAC-pro
index 0175a62..4c1546c 100755
--- a/scATAC-pro
+++ b/scATAC-pro
@@ -9,7 +9,7 @@
 #########################                                                                   
 
 SOFT="scATAC-pro"
-VERSION="1.4.0"
+VERSION="1.4.1"
 
 function usage {
     echo -e "usage : $SOFT -s STEP -i INPUT -c CONFIG [-o] [-h] [-v] [-b]"
diff --git a/scripts/bam2qc.sh b/scripts/bam2qc.sh
index b2b10b9..29c998d 100755
--- a/scripts/bam2qc.sh
+++ b/scripts/bam2qc.sh
@@ -24,14 +24,14 @@ if [[ "$isort" != "SO:coordinate"  ]]; then
     echo "Sorting bam file"
 
     mkdir -p ${mapRes_dir}/tmp
-    ${SAMTOOLS_PATH}/samtools sort -T ${mapRes_dir}/tmp/ -@ $ncore -n -o ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam $bam_file
+    ${SAMTOOLS_PATH}/samtools sort -m 2G -T ${mapRes_dir}/tmp/ -@ $ncore -n -o ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam $bam_file
 
     ## to mark duplicates
     ${SAMTOOLS_PATH}/samtools fixmate -@ $ncore -m ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
     rm ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam
 
     # Markdup needs position order
-    ${SAMTOOLS_PATH}/samtools sort -@ $ncore -T ${mapRes_dir}/tmp/ -o ${mapRes_dir}/${OUTPUT_PREFIX}.positionsort0.bam ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
+    ${SAMTOOLS_PATH}/samtools sort -m 2G -@ $ncore -T ${mapRes_dir}/tmp/ -o ${mapRes_dir}/${OUTPUT_PREFIX}.positionsort0.bam ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
     rm ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
 
     ## mark duplicates
diff --git a/scripts/call_peak.sh b/scripts/call_peak.sh
index 800e923..4e9dde0 100755
--- a/scripts/call_peak.sh
+++ b/scripts/call_peak.sh
@@ -33,8 +33,6 @@ if [ "${PEAK_CALLER}" = 'MACS2' ];then
 			${MACS2_PATH}/macs2 callpeak -t $input_bam --outdir $work_dir -n $out_prefix -f BAMPE $MACS2_OPTS 
 		fi 
 		
-	#${MACS2_PATH}/macs2 callpeak -t $input_bam --outdir $peaks_dir -f BAM $MACS2_OPTS --nomodel --extsize 147
-
     ## remove peaks whose chromosome is not list in the chrom_size file
     ${R_PATH}/Rscript --vanilla ${curr_dir}/src/rmRedundantPeaks.R ${work_dir}/${out_prefix}_peaks.narrowPeak \
          $CHROM_SIZE_FILE
diff --git a/scripts/iter_peak.sh b/scripts/iter_peak.sh
index 3846398..67094c3 100755
--- a/scripts/iter_peak.sh
+++ b/scripts/iter_peak.sh
@@ -40,10 +40,15 @@ ${PERL_PATH}/perl ${curr_dir}/src/split_bam2clusters0.pl --cluster_file ${output
 ## call peaks per cluster
 unset PYTHONHOME
 unset PYTHONPATH
+samPE="SAM"
+if [[ "$isSingleEnd"="FALSE"  ]]; then
+    samPE="SAMPE"
+fi
+
 for input_sam0 in $(find $output_dir -name *.sam); do
     pre=$(basename $input_sam0)
     pre=${pre/.sam/}
-    ${MACS2_PATH}/macs2 callpeak -t $input_sam0 --outdir $output_dir -n $pre -f SAM $MACS2_OPTS &
+    ${MACS2_PATH}/macs2 callpeak -t $input_sam0 --outdir $output_dir -n $pre -f $samPE $MACS2_OPTS &
 done
 wait
 
diff --git a/scripts/mapping.sh b/scripts/mapping.sh
index b481e9a..1cb80ea 100755
--- a/scripts/mapping.sh
+++ b/scripts/mapping.sh
@@ -28,7 +28,7 @@ echo "Sorting bam file"
 ncore=$(nproc --all)
 ncore=$(($ncore - 1))
 mkdir -p ${mapRes_dir}/tmp
-${SAMTOOLS_PATH}/samtools sort -T ${mapRes_dir}/tmp/ -@ $ncore -n -o ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam ${mapRes_dir}/${OUTPUT_PREFIX}.bam
+${SAMTOOLS_PATH}/samtools sort -m 2G -T ${mapRes_dir}/tmp/ -@ $ncore -n -o ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam ${mapRes_dir}/${OUTPUT_PREFIX}.bam
 rm ${mapRes_dir}/${OUTPUT_PREFIX}.bam
 
 ## to mark duplicates
@@ -36,7 +36,7 @@ ${SAMTOOLS_PATH}/samtools fixmate -@ $ncore -m ${mapRes_dir}/${OUTPUT_PREFIX}.so
 rm ${mapRes_dir}/${OUTPUT_PREFIX}.sorted.bam
 
 # Markdup needs position order
-${SAMTOOLS_PATH}/samtools sort -@ $ncore -T ${mapRes_dir}/tmp/ -o ${mapRes_dir}/${OUTPUT_PREFIX}.positionsort0.bam ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
+${SAMTOOLS_PATH}/samtools sort -m 2G -@ $ncore -T ${mapRes_dir}/tmp/ -o ${mapRes_dir}/${OUTPUT_PREFIX}.positionsort0.bam ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
 rm ${mapRes_dir}/${OUTPUT_PREFIX}.fixmate.bam
 
 ## mark duplicates
diff --git a/scripts/report.sh b/scripts/report.sh
index 35db874..c9e7b04 100755
--- a/scripts/report.sh
+++ b/scripts/report.sh
@@ -18,9 +18,14 @@ abs_out_dir=`cd ${OUTPUT_DIR}; pwd`
 
 curr_dir=`dirname $0`
 work_dir=`pwd`
+configure_dir=`dirname ${2}`
+configure_file=`basename ${2}`
+abs_configure_dir=`cd ${configure_dir}; pwd`
+abs_configure_file=${abs_configure_dir}/${configure_file}
 
-
+#${R_PATH}/Rscript --vanilla ${curr_dir}/src/render2report.R \
+#    ${abs_report_dir}/scATAC-pro_report_${OUTPUT_PREFIX}.html  $abs_out_dir ${work_dir}/${2}
 
 ${R_PATH}/Rscript --vanilla ${curr_dir}/src/render2report.R \
-    ${abs_report_dir}/scATAC-pro_report_${OUTPUT_PREFIX}.html  $abs_out_dir ${work_dir}/${2}
+    ${abs_report_dir}/scATAC-pro_report_${OUTPUT_PREFIX}.html  $abs_out_dir $abs_configure_file
 echo "Report generation Done!"
diff --git a/scripts/src/dsAnalysis_utilities.R b/scripts/src/dsAnalysis_utilities.R
index 8e0af88..cf40479 100644
--- a/scripts/src/dsAnalysis_utilities.R
+++ b/scripts/src/dsAnalysis_utilities.R
@@ -175,6 +175,11 @@ runSeurat_Atac <- function(mtx, npc = 50, top_variable_features = 0.2,
                        verbose = FALSE, seed.use = 10, npc = npc)
   if(length(reg.var) > 0 ) seurat.obj = regress_on_pca(seurat.obj, reg.var)
 
+  if(norm_by == 'tf-idf'){
+  ## redo normalization using all features
+     mtx.norm = TF_IDF(mtx)
+     seurat.obj[[assay]]@data = mtx.norm
+  }
 
   return(seurat.obj)
 }
diff --git a/scripts/src/integrate_mtx.R b/scripts/src/integrate_mtx.R
index cda6b8c..738dbbd 100644
--- a/scripts/src/integrate_mtx.R
+++ b/scripts/src/integrate_mtx.R
@@ -53,6 +53,11 @@ seurat.obj <- run_integration(mtx_list, integrate_by = integrate_by,
                             max_depth = 50000, reg.var = 'nCount_ATAC',
                             resolution = 0.6)
 
+# record input sample path as metadata to the seurat object
+dpath = data.table('sample' = paste0('sample', 1:len),
+                   'sample_path' = mtx_files)
+setkey(dpath, sample)
+seurat.obj$sample_path = dpath[J(seurat.obj$sample)]$sample_path
 
 saveRDS(seurat.obj, file = paste0(output_dir, '/seurat_obj_', integrate_by, '.rds'))
 
diff --git a/scripts/src/scATAC-pro_utils.R b/scripts/src/scATAC-pro_utils.R
index 8e0af88..cf40479 100644
--- a/scripts/src/scATAC-pro_utils.R
+++ b/scripts/src/scATAC-pro_utils.R
@@ -175,6 +175,11 @@ runSeurat_Atac <- function(mtx, npc = 50, top_variable_features = 0.2,
                        verbose = FALSE, seed.use = 10, npc = npc)
   if(length(reg.var) > 0 ) seurat.obj = regress_on_pca(seurat.obj, reg.var)
 
+  if(norm_by == 'tf-idf'){
+  ## redo normalization using all features
+     mtx.norm = TF_IDF(mtx)
+     seurat.obj[[assay]]@data = mtx.norm
+  }
 
   return(seurat.obj)
 }