diff --git a/tests/README.md b/tests/README.md
index 0eb390e..070bf7d 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -1,7 +1,7 @@
 # esp-open-rtos tests
 
 Testing is based on [Unity](https://github.com/ThrowTheSwitch/Unity) 
-C testing framework. 
+C testing framework.
 
 ## Features
 
@@ -15,16 +15,20 @@ C testing framework.
 There's a test runner script `test_runner.py` written in Python3 that runs
 test cases on ESP8266 connected to a host.
 
+Test runner is heavily relying on device reset using DTR and RTS signals.
+Popular ESP8266 boards such as **NodeMcu** and **Wemos D1** support device
+reset into flash mode.
+
 ### Options
 
 `--type` or `-t` - Type of test case to run. Can be 'solo' or 'dual'.
 If not specified 'solo' test will be run.
 
 `--aport` or `-a` - Serial port for device A. 
-If not specifid device `/dev/ttyUSB0` is used.
+If not specified device `/dev/ttyUSB0` is used.
 
 `--bport` or `-b` - Serial port for device B. 
-If not specifid device `/dev/ttyUSB1` is used.
+If not specified device `/dev/ttyUSB1` is used.
 
 `--no-flash` or `-n` - Do not flash the test firmware before running tests.
 
@@ -34,16 +38,20 @@ If not specifid device `/dev/ttyUSB1` is used.
 
 Build test firmware, flash it using serial device `/dev/tty.wchusbserial1410`
 and run only *solo* test cases:
+
 `./test_runner.py -a /dev/tty.wchusbserial1410`
 
-Build test firmware. Flash both devices as `-t dual` is specifid. And run both
+Build test firmware. Flash both devices as `-t dual` is specified. And run both
 *solo* and *dual* test cases:
+
 `./test_runner.py -a /dev/tty.wchusbserial1410 -b /dev/tty.wchusbserial1420 -t dual`
 
 Do not flash the firmware, only display available test cases on the device:
+
 `./test_runner.py -a /dev/tty.wchusbserial1410 -n -l`
 
 Do not flash the firmware and run only 2 and 4 test cases:
+
 `./test_runner.py -a /dev/tty.wchusbserial1410 -n 2 4`
 
 ## References