diff --git a/README.md b/README.md
index 058f471c7729e2deb1e9254ede7e2172bf6500c3..6927509d34823cc61876aa8aeb5bb4df24b5d653 100644
--- a/README.md
+++ b/README.md
@@ -19,5 +19,5 @@ The counts are normalized according to the length of the marker gene to a defaul
 
 For each sample, we can aggregate them with the following command:
 ```
-python3 build_matrix.py sample1_aggregated.tsv sample1_aggregated.tsv output_counts.tsv output_taxonomy.tsv
+python3 build_matrix.py sample1_aggregated.tsv sample2_aggregated.tsv ... output_counts.tsv output_taxonomy.tsv
 ```