Update readme (minor fix)

README.md

@@ -36,14 +36,14 @@ This command should sort you out:
 pip3 install pymupdf reportlab pyqt5
 ```
 
-## Building
+## Building (freezing)
 To build the binary distribution using PyInstaller, simply run:
 ```bash
 pyinstaller {mac|linux|win}.spec
 ```
 The generated binary will be in the 'dist' subfolder. 
 
-### Version number on Windows
+### Version numbering on Windows
 If you are building on Windows and alter the version number, make sure to run `generate_version_rc.py` to update the version.rc file. This file is included in the generated executable and contains the version information viewable in Windows Explorer properties.
 
 ## License