diff --git a/WINDOWS_INSTALL.md b/WINDOWS_INSTALL.md
index e1035279..cae47d43 100644
--- a/WINDOWS_INSTALL.md
+++ b/WINDOWS_INSTALL.md
@@ -24,6 +24,16 @@ You may need to install git, by clicking at ***Download and install***
 ![pycharm project screen](./docs/img/img_2.png)
 you will end with a project like this.
 
+
+# Configure PyCharm.
+
+We use 2 spaces as a tab instead standard [pep8](https://www.python.org/dev/peps/pep-0008/) 4 spaces indentation.
+
+this option could be configured in PyCharm at the settings screen as shown in the picture.
+
+![pycharm configuration screen](./docs/img/img_5.png)
+
+
 # Start your own project.
 
 1. Click on file new project like in the image