diff --git a/src/junctions/junctions_extractor.cc b/src/junctions/junctions_extractor.cc
index b2cfafd..8960513 100644
--- a/src/junctions/junctions_extractor.cc
+++ b/src/junctions/junctions_extractor.cc
@@ -136,6 +136,7 @@ int JunctionsExtractor::usage(ostream& out) {
     out << "\t\t" << "-s INT\tStrandness mode \n"
         << "\t\t\t " << "XS, use XS tags provided by aligner; RF, first-strand; FR, second-strand. REQUIRED" << endl;
     out << "\t\t" << "-t STR\tTag used in bam to label strand. [XS]" << endl;
+    out << "\t\t" << "-b STR\tThe file containing the barcodes of interest for single cell data." << endl;
         
     out << endl;
     return 0;
@@ -580,4 +581,4 @@ string JunctionsExtractor::get_splice_site(Junction & line) {
         splice_site = seq1 + "-" + seq2;
     }
     return splice_site;
-}
\ No newline at end of file
+}