update README

README.md

@@ -1,5 +1,6 @@
 # debfetcher
-debfetcher automates fetching  and installing certain .deb packages from apt repos.
+debfetcher enables fetching, installing and updating certain .deb packages from apt repos for non-Debian
+distributions.
 
 ## Features
  - apt signature and package checksum verification
@@ -11,7 +12,7 @@ Often they are not available in the repos of others distros. Even if they are, s
 
 Examples for such packages are: Brave, Signal-Desktop, Element-Desktop, Spotify etc.
 
-debfetcher can fetch such packages from the official apt repos.
+debfetcher can fetch such packages from the official apt repos and keep them up to date.
 
 The binaries in the .deb actually work on other distributions (often)
 
@@ -64,7 +65,7 @@ A template contains the repo URI, package name etc and specifies where to extrac
 ```
 
 ## User-level installation
-If you don't need/want a system-wide installation , debfetcher can be used to install a package in your local user profile. Therefore, debfetcher can be used without polluting your /.
+If you don't need/want a system-wide installation of a package, debfetcher can be used to install a package in your local user profile. Therefore, debfetcher can be used without polluting your /.
 
 Refer to `debfetcher.user.conf.sample` to change the appropriate settings.
 
@@ -73,6 +74,9 @@ Execute
 DEBFETCHER_CONFIG="/path/to/debfetcher.user.conf" ./debfetcher.sh get signal
 ```
 
+Note: The config/data directories of the installed packages won't change, which may or may not be
+problematic.
+
 ## Usage
 ### Install a package
 ```