diff --git a/README.md b/README.md
index 6a5e6cb..36af749 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,38 @@
-GVM
-===============
+# GVM
 
-A Godot Version Manager written in Python
\ No newline at end of file
+A Godot Version Manager written in Python.
+You can download launch and remove **(WIP)** stable Godot versions.<br>
+It's for people who want an unified experience of managing Godot
+instead of losing track of every sole version they use.
+
+## Dependencies
+
+You need **[requests](https://pypi.org/project/requests/)** for the application to work.<br>
+Pyinstaller is only needed for building.
+
+## Building from source
+
+This project is supposed to only run on Linux and Windows.
+
+### Windows
+
+<ol>
+<li>Install [Python](https://www.python.org/)</li>
+<li>You have to clone the repo. (<code>git clone http://kairoto.com:8080/git/Kairoto/GVM.git</code>)</li>
+<li>Install the needed dependencies. (<code>pip install requests pyinstaller</code>)</li>
+<li>Use pyinstaller to build the app. (<code>pyinstaller -D -F -n GVM.exe main.py</code>)</li>
+</ol>
+<span style="color: #888">Our pyinstaller command is recommended and tested.</span>
+
+### Linux
+
+<ol>
+<li>Install [Python](https://www.python.org/) suiting your distro.</li>
+<li>Install pip suiting your distro too.
+<li>You have to clone the repo. (<code>git clone http://kairoto.com:8080/git/Kairoto/GVM.git</code>)</li>
+<li>Create a virtual environment by using <code>python -m venv {ENV_NAME}</code>. </li>
+<li>Activate the virtual environment (<code>python -m venv {ENV_NAME}</code>).</li>
+<li>Install the needed dependencies. (<code>pip install requests pyinstaller</code>)</li>
+<li>Use pyinstaller to build the app. (<code>pyinstaller -D -F -n GVM.exe main.py</code>)</li>
+</ol>
+<span style="color: #888">Our pyinstaller command is recommended and tested.</span>
\ No newline at end of file
diff --git a/main.py b/main.py
index b0e4ed8..c57436f 100644
--- a/main.py
+++ b/main.py
@@ -24,7 +24,7 @@
       openSettings()
 
 def getAppDir() -> None :
-   app_path.set(fd.askdirectory(initialdir=pathlib.Path.home()))
+   app_path.set(fd.askdirectory(initialdir=pathlib.Path.home(),mustexist=True))
 
 def quit() -> None :
    FRONTEND.quit()