diff --git a/docs/building/index.md b/docs/building/index.md
index b897f53..abb036f 100644
--- a/docs/building/index.md
+++ b/docs/building/index.md
@@ -95,6 +95,8 @@ For more security, remember to generate a new attestation key and certificate.
 Change to the `tools` directory, run the `generate-certs.sh` to generate a new attestation key and certificate:
 
 ``` sh
+$ cp ./certs/myserver.cnf.example ./certs/myserver.cnf
+
 $ cd ./nrf52-u2f/tools
 
 $ ./generate-certs.sh
@@ -102,6 +104,15 @@ $ ./generate-certs.sh
 
 If successfully completed, the private key and certificate are stored in `certs/keys.c` file.
 
+## Get micro-ecc library
+
+```sh
+cd nrf_sdks/nRF5_SDK_15.2.0_9412b96/external/micro-ecc
+git clone https://github.com/kmackay/micro-ecc.git
+cd nrf52hf_armgcc/armgcc
+make
+```
+
 ## Build the U2F Firmware
 
 Now you are ready to build nRF52-U2F source code.
diff --git a/docs/upgrading/index.md b/docs/upgrading/index.md
index 5ec3cd1..ef929fb 100644
--- a/docs/upgrading/index.md
+++ b/docs/upgrading/index.md
@@ -55,7 +55,7 @@ Run the following command to upgrade the U2F firmware, where:
 * `<serial-port>` is the serial port address to which the device is connected. (e.g. `COM1` in windows systems, `/dev/ttyACM0` in linux/mac).
 
 ``` sh
-nrfutil dfu usb_serial -pkg <package-path> -p <serial-port>
+nrfutil dfu usb-serial -pkg <package-path> -p <serial-port>
 ```
 
 ![](images/upgrading-app-with-nrfutil.png)