Update 'Home'

Home.md

@@ -104,7 +104,16 @@ services:
       - .env
 ```
 
-Then open `html/tt-rss` in your source code editor of choice.
+Then open `html/tt-rss` in your source code editor of choice. You can enable PHP debugging using `.env`:
+
+```
+TTRSS_XDEBUG_ENABLED=yes
+
+#TTRSS_XDEBUG_HOST=
+# defaults to host IP
+
+#TTRSS_XDEBUG_PORT=9000
+```
 
 ### I'm running into 502 errors and/or other connectivity issues