diff --git a/README.md b/README.md
index 9ee284f..b982b98 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,11 @@ Command Examples (for Singularity only):
 
     conda create -c rdkit -n ann_env rdkit python=3.5.2
 	
+	source activate ann_dev
+	
     pip install -r singularity-install/requirements.txt
+	
+	source deactivate ann_dev
 
 3. Run your algorithm scripts by SLURM shell