diff --git a/doc/CHANGELOG.md b/doc/CHANGELOG.md
index 0efce25..40eb3f8 100644
--- a/doc/CHANGELOG.md
+++ b/doc/CHANGELOG.md
@@ -6,6 +6,12 @@ This project adheres to [Semantic Versioning 2.0.0](http://semver.org/).
 keybrd version 0.x.x is for initial development.
 keybrd version 1.0.0 will be released when the public API is stable.
 
+0.6.6 (2016-11-16)
+------------------
+* Enhancements
+  * rename #define SAMPLE_COUNT_MACRO to const SAMPLE_COUNT
+  * change #include <keybrd library file> angle bracket to double quotes
+
 0.6.5 (2016-11-16)
 ------------------
 * Enhancements
diff --git a/doc/keybrd_library_user_guide.md b/doc/keybrd_library_user_guide.md
index 8a760c3..e96c7c4 100644
--- a/doc/keybrd_library_user_guide.md
+++ b/doc/keybrd_library_user_guide.md
@@ -147,7 +147,7 @@ Development-environment items to check:
 ```
     'KEY_A' was not declared in this scope
 ```
-  Where 'KEY_A' could be any scan code.
+  Where 'KEY_A' could be any scancode.
   Fix this error from the Arduino IDE tool bar: Tools > USB Type > Keyboard + Mouse + Joystick
 
 * If last line in Arduino IDE says "Low memory available",
diff --git a/library.properties b/library.properties
index 6ce6239..0d1a12d 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=keybrd
-version=0.6.5
+version=0.6.6
 author=Wolfram Volpi
 maintainer=Wolfram Volpi
 sentence=A library for creating custom-keyboard firmware.