1. Complete the README.md

Author: d0u9

Diff for: 9_pipe-advanced-sleep/README.md

@@ -1,6 +1,14 @@
-# pipe-simple-sleep
+# pipe-advanced-sleep
 
 ## Description
 
+This example shows a kernel module which act similar to a pipe. We used advanced sleep technology to suspend a process
+when its requested data is invaliable. The advanced sleep is different from simple sleep technology for that advanced 
+sleep can give us more free to control all the details during the sleeping procedure.
+
 ## Usage
 
+1. Comlile source code and load the module via `sudo ./load_module` command.
+2. Write to or read from `/dev/pipeX` in two distict processes. You will observe
+that one process would be blocked when there is no data avaible and could run
+again when another process read from or write to the same device.