diff --git a/KLayout-Python-Module-Prototype.md b/KLayout-Python-Module-Prototype.md
index 9779e42..93769ed 100644
--- a/KLayout-Python-Module-Prototype.md
+++ b/KLayout-Python-Module-Prototype.md
@@ -12,11 +12,18 @@ For building use the build script:
 ./build.sh -bin <your-installation-path> 
 ```
 
+If you want it fast and don't need to Qt bindings, use:
+
+```
+# From the project's root directory
+./build.sh -bin <your-installation-path> -without-qtbinding
+```
+
 For ```<your-installation-path>``` pick a destination where you want KLayout to be installed. For example you can use ```/usr/local/klayout``` for the destination, but you will need sudo permissions then:
 
 ```
 # Build and install in /usr/local/klayout
-sudo ./build.sh -bin /usr/local/klayout
+sudo ./build.sh -bin /usr/local/klayout -without-qtbinding
 ```
 
 The `klayout` module will be built together with KLayout. After KLayout installation, the `klayout` module resides inside the installation tree in the "pymod" subfolder. To use it, either copy the `klayout` folder to your Python installation or set `PYTHONPATH` to the location of the `klayout` folder: