diff --git a/.DS_Store b/.DS_Store
index 38f525a..afb1bdc 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/README.md b/README.md
index dc59844..f7ec712 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,11 @@ Computational environments supported:
 1. Download and put a dataset, e.g. Chembl-1024-jaccard.hdf5, under "data" folder;
 2. Download and put a Singularity image file, e.g. "ann-bench-nmslib3.sif" under "singularity" folder.
 
-# Executions under a PC with Singularity
+# Executions under a PC through Singularity
+1. pip install -r requirements.txt
+
+2. Run your algorithm
+
 Run.py Parameters:
 
     dataset: dataset name (Required)
diff --git a/requirements.txt b/requirements.txt
index 5677802..4b8d866 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 ansicolors==1.1.8
 docker==2.6.1
+singularity==3.1.1
 h5py==2.7.1
 matplotlib==2.1.0
 numpy==1.13.3