diff --git a/DigitalSynthVRA8U/DigitalSynthVRA8U.ino b/DigitalSynthVRA8U/DigitalSynthVRA8U.ino
index a0d4dca..6987707 100644
--- a/DigitalSynthVRA8U/DigitalSynthVRA8U.ino
+++ b/DigitalSynthVRA8U/DigitalSynthVRA8U.ino
@@ -1,6 +1,6 @@
-////////////////////////////////////////////////////////////////////////////////////////////
-// Digital Synth VRA8-U -- We strongly recommend Arduino AVR Boards core 1.8.3 (or 1.8.5) //
-////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////
+// Digital Synth VRA8-U -- We strongly recommend Arduino AVR Boards core 1.8.5 //
+/////////////////////////////////////////////////////////////////////////////////
 
 //#define DEBUG
 
diff --git a/README.md b/README.md
index bcfe151..2bb9196 100644
--- a/README.md
+++ b/README.md
@@ -13,12 +13,11 @@
 
 ## Caution about Arduino
 
-- We *strongly recommend* **Arduino AVR Boards core 1.8.3 (or 1.8.5)**
-    - If you use other than 1.8.3 (or 1.8.5), the sketch *may not work well*: CPU Busy LED (LED L) *may almost always lit*
+- We *strongly recommend* **Arduino AVR Boards core 1.8.5**
+    - If you use other than 1.8.5, the sketch *may not work well*: CPU Busy LED (LED L) *may almost always lit*
 
 ## Change History
 
-- v1.x.x: Change to recommend Arduino AVR Boards core 1.8.3 (or 1.8.5)
 - v1.2.1: Reverses the effect of the Osc 1 Shape II value for SS (Shaped Saw Wave)
 - v1.2.0: Change the range of Osc 1 Shape from -64 -- +63 to 0 -- 127; Fix the comment on Osc 1 Shape II in VRA8-U CTRL
 - v1.1.1: Reduce noise in Chorus Mode M and S2
@@ -49,7 +48,7 @@
 ## VRA8-U CTRL
 
 - MIDI Controller (Editor) Application for VRA8-U, HTML App (Web App)
-- VRA8-U CTRL converts Program Changes (#0-7 for PRESET, #8-15 for user programs) into Control Changes
+- VRA8-U CTRL converts Program Changes (#0-7 for PRESET, #0-15 for user programs) into Control Changes
 - VRA8-U CTRL stores the current control values and the user programs (#8-15) in a Web browser (localStorage)
 - We recommend using Google Chrome, which implements Web MIDI API
 - We recommend [loopMIDI](https://www.tobias-erichsen.de/software/loopmidi.html) (virtual loopback MIDI cable) to connect VRA8-U