diff --git a/README.md b/README.md
index 0a0baf7..0f30ada 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ ____
 
 **Dependencies:**  
 >
-> * [bash](https://www.gnu.org/software/bash/) (tested version 5.1.4 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/))
+> * [bash](https://www.gnu.org/software/bash/) (tested versions: 5.1.4 on [Debian GNU/Linux 11](http://ftp.debian.org/debian/dists/bullseye/), 5.0.17 on [Ubuntu 20](https://wiki.ubuntu.com/FocalFossa/ReleaseNotes), 4.2.46 on [CentOS 7](https://wiki.centos.org/Manuals/ReleaseNotes/CentOS7.2009))
 
 |  POSITION | PARAMETERS   |       DESCRIPTION      |    DEFAULT    |
 |-----------|--------------|------------------------|---------------|
@@ -30,7 +30,13 @@ Example usage in terminal with make the script executable:
 ```bash
 wget https://git.hmp.today/pavel.muhortov/utils/raw/branch/master/build-python.sh
 chmod u+x ./build-python.sh
-sudo ./build-python.sh qn 3.9.5 ./build-python.log
+sudo ./build-python.sh - 3.9.5
+```
+
+Example usage in terminal without download:  
+
+```bash
+sudo su - -c "bash <(curl -s https://git.hmp.today/pavel.muhortov/utils/raw/branch/master/build-python.sh) qn 3.9.5 install-python.log"
 ```
 
 ____
diff --git a/build-python.sh b/build-python.sh
index 2fd554d..426832b 100644
--- a/build-python.sh
+++ b/build-python.sh
@@ -147,7 +147,7 @@ downloadcode(){
 bulidingcode(){
   cd "Python-${subvers}" || execerror "cd"
   ./configure --enable-optimizations --prefix=/usr/local/opt/python-"${version}"
-  make
+  make clean
 }
 
 #######################################