diff --git a/HELP.md b/HELP.md
index c6372798..7d7581ce 100644
--- a/HELP.md
+++ b/HELP.md
@@ -242,6 +242,13 @@ Right mouse click button shows context menu with items:
 | `F9`                  | open
 | `Esc`                 | close
 
+One panel mode
+---------------
+Cloud Commander could work in one panel mode when screen size can not accommodate second panel.
+It could happen when mobile device, tablet or small window size used to work with file manager.
+
+![One panel mode](/img/screen/one-panel-mode.png "One panel mode")
+
 Server
 ---------------
 Standard practices say no non-root process gets to talk to
diff --git a/img/screen/one-panel-mode.png b/img/screen/one-panel-mode.png
new file mode 100644
index 00000000..36ec8a17
Binary files /dev/null and b/img/screen/one-panel-mode.png differ