diff --git a/README.md b/README.md
index b94c2c8..c8961a5 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 
 **openwifi:** Linux mac80211 compatible full-stack IEEE802.11/Wi-Fi design based on SDR (Software Defined Radio).
 
-This repository includes Linux driver and software. [openwifi-hw](https://github.com/open-sdr/openwifi-hw) repository has the FPGA design. [[Project document](https://github.com/open-sdr/openwifi/tree/master/doc)]
+This repository includes Linux driver and software. [openwifi-hw](https://github.com/open-sdr/openwifi-hw) repository has the FPGA design. [[Quick start](#Quick-start)], [[Project document](https://github.com/open-sdr/openwifi/tree/master/doc)], [[Application notes](doc/app_notes/README.md)]
 
 [[Videos](#Videos)] [[Papers](#Papers)] [openwifi [maillist](https://lists.ugent.be/wws/subscribe/openwifi)] [[Cite openwifi project](#Cite-openwifi-project)]
 
@@ -54,6 +54,8 @@ zcu102_9371|Xilinx ZCU102 dev board + ADRV9371|Future|None
 [[Build openwifi Linux img from scratch](#Build-openwifi-Linux-img-from-scratch)]
 [[Special note for 11b](#Special-note-for-11b)]
 [[Porting guide](#Porting-guide)]
+[[Project document](https://github.com/open-sdr/openwifi/tree/master/doc)]
+[[Application notes](doc/app_notes/README.md)]
 
 ## Quick start
 - Burn openwifi board specific img file (from the table) into a SD card ("Open With Disk Image Writer". Or "dd" command after unzip). The SD card has two partitions: BOOT and rootfs. You need to config the **correct files in the BOOT partition** according to the **board you have** by operation on your computer: 
diff --git a/doc/app_notes/ad-hoc-two-sdr.md b/doc/app_notes/ad-hoc-two-sdr.md
index 0eedd18..64ebd63 100644
--- a/doc/app_notes/ad-hoc-two-sdr.md
+++ b/doc/app_notes/ad-hoc-two-sdr.md
@@ -1,2 +1,48 @@
-- To be done.
-- Tobe done
+- Power on two SDR boards. Call one board "adhoc1" and the other "adhoc2". On each board, the TX and RX antenna should vertical/orthogonal to each other as much as possible to gain a good TX/RX isolation.
+- Connect a computer to the adhoc1 via Ethernet cable. The computer should have static IP 192.168.10.1. Open a terminal on the computer, and then in the terminal:
+  ```
+  ssh root@192.168.10.122
+  (password: openwifi)
+  service network-manager stop
+  cd openwifi
+  ./wgd.sh
+  (Wait for the script completed)
+  ifconfig sdr0 up
+  ./sdr-ad-hoc-up.sh sdr0 44 192.168.13.1
+  (Above command setup ad-hoc network at channel 44 with static IP assigned to sdr0 NIC)
+  iwconfig sdr0
+  ```
+- You shold see output like:
+  ```
+  sdr0    IEEE 802.11  ESSID:"sdr-ad-hoc"  
+          Mode:Ad-Hoc  Frequency:5.22 GHz  Cell: 92:CA:14:27:1E:B0   
+          Tx-Power=20 dBm   
+          Retry short limit:7   RTS thr:off   Fragment thr:off
+          Encryption key:off
+          Power Management:off
+  ```
+  If you see "Cell: Not-Associated", please wait and run "iwconfig sdr0" again until a randomly generated Cell ID appears.
+
+- Connect another computer to the adhoc2 via Ethernet cable. The computer should have static IP 192.168.10.1. Open a terminal on the computer, and then in the terminal:
+  ```
+  ssh root@192.168.10.122
+  (password: openwifi)
+  service network-manager stop
+  cd openwifi
+  ./wgd.sh
+  ifconfig sdr0 up
+  ./sdr-ad-hoc-up.sh sdr0 44 192.168.13.1
+  iwconfig sdr0
+  ```
+- You shold see output like:
+  ```
+  sdr0    IEEE 802.11  ESSID:"sdr-ad-hoc"  
+          Mode:Ad-Hoc  Frequency:5.22 GHz  Cell: 92:CA:14:27:1E:B0   
+          Tx-Power=20 dBm   
+          Retry short limit:7   RTS thr:off   Fragment thr:off
+          Encryption key:off
+          Power Management:off
+  ```
+  The "Cell: 92:CA:14:27:1E:B0" should be the same as adhoc1, because the later joined node should discover the Cell ID of the existing network and join/get it automatically. If not, please adjust the antenna/distance and re-run the commands.
+
+  Now the communication link should be already setup between the two ad-hoc nodes, and you can ping each other.