diff --git a/resources/usage.md b/resources/usage.md
index 8f703ff..a40eb34 100644
--- a/resources/usage.md
+++ b/resources/usage.md
@@ -1,8 +1,10 @@
 ####Setting the root directory
 Choose Set HOME folder... from the File menu.
+####Window layout
+There are three panels: Catlog/Output/Disk layout. The left and right panels can be hidden.
 ####Selecting a disk
-Click once on a disk to display the contents of the disk. Double-click a disk to open it in a new tab.
+Click once on a disk in the Catalog Panel to display the contents of the disk. Double-click a disk to open it in a new tab.
 ####Displaying a file in different formats
-Select Formatted/Hex/Assembler
+Select Formatted/Hex Dump/Disassembler tabs in the Output Panel
 ####Displaying a disk sector
-Click a sector in the display.
+Click a sector in the Disk layout Panel.