diff --git a/src/web/README.md b/src/web/README.md
index e5ea75bc..0a62552f 100644
--- a/src/web/README.md
+++ b/src/web/README.md
@@ -53,25 +53,59 @@ We use the Flask-Babel library and Flask/Jinja2 extension for i18n.
 
 It uses the 'pybabel' command line tool for extracting and compiling localizations.
 Activate the Python venv in src/web/ to use it:
-
+```
 $ cd src/web/
 $ source venv/bin/activate
 $ pybabel --help
+```
 
-To create a new localization, it needs to be added to accept_languages in
-the get_locale() method, and also to localizer.cpp in the RaSCSI C++ code.
+To create a new localization, it needs to be added to the LANGAUGES constant in
+web/settings.py. To localize messages coming from the RaSCSI backend, update also code in
+raspberrypi/localizer.cpp in the RaSCSI C++ code.
 
 Once this is done, follow the steps in the [Flask-Babel documentation](https://flask-babel.tkte.ch/#translating-applications)
 to generate the messages.po for the new language.
 
-Updating an existing messages.po is also covered above.
+Updating the strings in an existing messages.po is also covered above.
 
 When you are ready to contribute new or updated localizations, use the same Gitflow Workflow as used for any code contributions to submit PRs against the develop branch.
 
+### Working with PO files
+
+See the [GNU gettext documentation](https://www.gnu.org/software/gettext/manual/html_node/PO-Files.html) for an introduction to the PO file format.
+
+We make heavy use of __python-format__ for formatting, for instance:
+```
+#: file_cmds.py:353
+#, python-format
+msgid "%(file_name)s downloaded to %(save_dir)s"
+msgstr "Laddade ner %(file_name)s till %(save_dir)s"
+```
+
+There are also a few instances of formatting in JavaScript:
+```
+#: templates/index.html:381
+msgid "Server responded with code: {{statusCode}}"
+msgstr "Servern svarade med kod: {{statusCode}}"
+```
+
+And with html tags:
+```
+#: templates/index.html:304
+#, python-format
+msgid ""
+"Emulates a SCSI DaynaPORT Ethernet Adapter. <a href=\"%(url)s\">Host "
+"drivers and configuration required</a>."
+msgstr ""
+"Emulerar en SCSI DaynaPORT ethernet-adapter. <a href=\"%(url)s\">Kräver "
+"drivrutiner och inställningar</a>."
+```
+
 ### (Optional) See translation stats for a localization
 Install the gettext package and use msgfmt to see the translation progress.
-
+```
 $ sudo apt install gettext
 $ cd src/web/
 $ msgfmt --statistics translations/sv/LC_MESSAGES/messages.po
 215 translated messages, 1 untranslated message.
+```