diff --git a/README.md b/README.md
index 33b50b1..1d8f44c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
-# arduino (pro) micro macro keyboard V3 
+# V4 - Allows switching to next AND previous profile
 
-V4 update in branch but not necessary.
+## This update uses short presses of the profile selector switch to go to the next profile and long presses to go to the previous profile. Changes do not affect any pre-existing profiles, they only modify the behaviour of the profile selector button.
 
 ![Best rendering (3)](https://user-images.githubusercontent.com/76870663/133833800-85e0ed2d-d4ae-48e4-a4c3-c7bc171ead55.png)
 
@@ -52,7 +52,8 @@ USB type C or micro-usb connector, the mini-USB version will not fit!
 files. 
 3. Go to the 'libraries' folder in your arduino installation and paste the 2 subfolders inside the 'required libraries'
 folder into the 'libraries' folder in your arduino installation. 
-4. Then open the arduino_micro_shift_register_piso_rot_enc_psbtn_OLED_V3.ino file.
+### 4. [V4 update] Install ezButton library: Go to Sketch > Include Library > Manage Libraries... > Search for 'ezButton' in search bar > Install
+5. Then open the arduino_micro_shift_register_piso_rot_enc_psbtn_ezbtn_OLED_V4.ino file.
 
 How to modify the code to suit you is explained in this youtube video:
 https://www.youtube.com/watch?v=DriOpHgIRV4
@@ -214,7 +215,9 @@ NicoHood for developing the HID library and
 Henning Karlsen of Rinky-Dink Electronics for developing a 
 lightweight OLED library. DroneBot workshop for providing the 
 basic code to run the 74HC165 PISO shift register. Their 
-libraries are included in the ZIP file. 
+libraries are included in the ZIP file. And also ArduinoGetStarted
+for providing the ezButton library.
+
 
 
 
diff --git a/arduino_micro_shift_register_piso_rot_enc_psbtn_OLED_V3.zip b/arduino_micro_shift_register_piso_rot_enc_psbtn_OLED_V3.zip
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diff --git a/arduino_micro_shift_register_piso_rot_enc_psbtn_ezbtn_OLED_V4.zip b/arduino_micro_shift_register_piso_rot_enc_psbtn_ezbtn_OLED_V4.zip
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