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diff --git a/README.md b/README.md
index 2ef8368..7e84511 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,17 @@ This is a simple bash script to swap all windows between two workspaces on Linux
 This may be useful when you want to change the order of the workspaces but your
 DE doesn't have such feature (XFCE as an example).
 
+## Requirements
+
+* wmctrl
+
+## Usage
+
+	swap_workspaces [<1>] <2>
+
+If the first workspace is not specified, current workspace is assumed.
+Workspace numbering starts with 0.
+
 ## License
 
 BSD-2c