diff --git a/developer_manual/app/index.rst b/developer_manual/app/index.rst
index cd62621be..c6a018b1a 100644
--- a/developer_manual/app/index.rst
+++ b/developer_manual/app/index.rst
@@ -31,6 +31,7 @@ App development
    publicpage
    testing
    coding-style
+   psr
    ../api
 
 
diff --git a/developer_manual/app/psr.rst b/developer_manual/app/psr.rst
new file mode 100644
index 000000000..83b18f93b
--- /dev/null
+++ b/developer_manual/app/psr.rst
@@ -0,0 +1,12 @@
+===
+PSR
+===
+
+.. sectionauthor:: Christoph Wurst <christoph@winzerhof-wurst.at>
+
+On this page you find information about the implemented `php standards recommendations <https://www.php-fig.org/psr/>`_ in Nextcloud.
+
+PSR-3: Logger Interface
+-----------------------
+
+As of Nextcloud 19, the dependency injection container can inject an instance of a ``\Psr\Log\LoggerInterface``. This is merely a wrapper of the existing (and strongly typed) ``\OCP\ILogger``. Apps may still use the Nextcloud logger, but the PSR-3 implementation shall easy the integration of 3rd party libraries that require the PSR-3 logger.