diff --git a/README.md b/README.md
index 12991f410afde33f0ff03ac21f7a6b6d487b6c75..d5ae7797fc4db469be5a35224246dbf4829acff4 100644
--- a/README.md
+++ b/README.md
@@ -5,9 +5,12 @@
 
 The current repository contains all the code and data necessary to reproduce the paper results. 
 
-
 ## Installation
-Set the environment with `make`:
+
+Easily set up the environment with `make` command. 
+
+Prerequisite : [conda library]( https://docs.conda.io/projects/conda/en/latest/user-guide/install/linux.html)\
+Effect : data unzipping, conda environment setting up.
 
 ## Authors
 C. Robardet, A. Batel, M. Plantevit, I. Benouaret
diff --git a/makefile b/makefile
index 743059f791fcf173701995eb2637af76494ee1f5..d84e05515e402b8d2bbe498bcede46eba1d6beee 100644
--- a/makefile
+++ b/makefile
@@ -6,6 +6,7 @@ build: check_conda
 	conda env create --file cdbpr-env.yml
 clean:
 	rm -rf data/
+	rm -rf results/
 
 check_conda:
 	@if command -v conda >/dev/null 2>&1; then \