diff --git a/README.md b/README.md
index dc8f128..dcf9363 100644
--- a/README.md
+++ b/README.md
@@ -352,6 +352,9 @@ Detailed Usage
           process_with_bam: processing from bam file
                                 input: bam file for aggregated data, outputted from the mapping module 
                                 output: filtered peak-by-cell matrix and all intermediate results 
+          rmDoublets: remove potential doublets
+                         input: a peak-by-cell matrix file or a seurat object file in .rds format
+                         output: doublets removed  matrix.rds and barcodes.txt file and seurat objects w/ and w/o doublets saved in the input directory (and a umap plot colored by singlet/doubet) 
           clustering: cell clustering
                                input: filtered peak-by-cell matrix file, outputted from the call_cell module (or a seurat.rds file)
                                output: seurat objects with clustering label in the metadata (.rds file) and 
@@ -421,9 +424,6 @@ Detailed Usage
           visualize: interactively visualize the data through VisCello
                          input: VisCello_obj directory, outputted from the clustering module
                          output: launch VisCello through web browser for interactively visualization"
-          rmDoublets: remove potential doublets
-                         input: a peak-by-cell matrix file or a seurat object file in .rds format
-                         output: doublets removed  matrix.rds and barcodes.txt file and seurat objects w/ and w/o doublets saved in the input directory (and a umap colored by singlet/doubet) 
 
           addCB2bam: add cell barcode tag to bam file
                          input: a bam file generated by scATAC-pro
diff --git a/scripts/dex_fastq_single.sh b/scripts/dex_fastq_single.sh
index 26a9ece..a9841e1 100755
--- a/scripts/dex_fastq_single.sh
+++ b/scripts/dex_fastq_single.sh
@@ -65,7 +65,7 @@ else
              ${output_dir}/tmp${i}_demplxed_${dex_prefix1} ${fastqs[$i]} &
             ${PYTHON_PATH}/python ${curr_dir}/src/dex_fastq_extraIndex.py ${output_dir}/demplxed_${dex_prefix2} \
              ${output_dir}/tmp${i}_demplxed_${dex_prefix2} ${fastqs[$i]} &
-            
+           wait 
             mv ${output_dir}/tmp${i}_demplxed_${dex_prefix1} ${output_dir}/demplxed_${dex_prefix1}
             mv ${output_dir}/tmp${i}_demplxed_${dex_prefix2} ${output_dir}/demplxed_${dex_prefix2}
         done