README.md : Added change ext2/3/4 filesystem size notes

README.md

@@ -215,5 +215,13 @@ openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -sha256 -days 3
 ## Bind to port 80 or 443
 
 [Is there a way for non-root processes to bind to "privileged" ports on Linux?](https://stackoverflow.com/questions/413807/is-there-a-way-for-non-root-processes-to-bind-to-privileged-ports-on-linux)
-
 [Allow non-root process to bind to port 80 and 443?](https://superuser.com/questions/710253/allow-non-root-process-to-bind-to-port-80-and-443)
+
+## Change ext2/3/4 filesystem size
+
+```sh
+umount $FS
+e2fsck -f $FS
+resize2fs $FS $SIZE
+mount $FS $MOUNT_POINT
+```