add current note

fix image
gliadis · Jun 2, 2015 · bda23fa · bda23fa
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diff --git a/README.md b/README.md
@@ -201,6 +201,13 @@ Libraries that don't rely on low-level access to AVR registers should work well.
 Pick the correct serial port.
 You need to put ESP8266 into bootloader mode before uploading code.
 
+#### Power Supply ####
+
+For stable use of the ESP8266 a power supply with 3V3 and >= 250mA is required.
+
+* Note
+ - using Power from USB to Serial is may unstable, they not deliver enough current. 
+
 #### Minimal hardware Setup for Bootloading and usage ####
 
 ESPxx Hardware

diff --git a/doc/ESP_to_serial.png b/doc/ESP_to_serial.png