diff --git a/README.md b/README.md
index 6cb82fc..a50ec3d 100644
--- a/README.md
+++ b/README.md
@@ -32,10 +32,12 @@ This library only works on AVR Microcontroller.
 * Atmega328pb - 10 bytes
 * Atmega328p - 9 bytes
 * Atmega2560 - 9 bytes
+* Attiny85 - 9 bytes
 
 ## Installation
 
-* Install the library by [Importing the .zip library](https://www.arduino.cc/en/Guide/Libraries#toc4) using either the [master](https://github.com/ricaun/ArduinoUniqueID/archive/master.zip) or one of the [releases](https://github.com/ricaun/ArduinoUniqueID/releases) ZIP files.
+* Install the library by [Using the Library Manager](https://www.arduino.cc/en/Guide/Libraries#toc3)
+* **OR** by [Importing the .zip library](https://www.arduino.cc/en/Guide/Libraries#toc4) using either the [master](https://github.com/ricaun/ArduinoUniqueID/archive/1.0.3.zip) or one of the [releases](https://github.com/ricaun/ArduinoUniqueID/releases) ZIP files.
 
 ## Examples
 
@@ -68,4 +70,13 @@ Print the hexadecimal bytes of the Unique Serial ID on the Stream.
 void UniqueIDdump(Stream);
 ```
 
+### Variable: UniqueID8
+
+UniqueID8 has the last 8 bytes array of the Unique Serial ID.
+
+```c
+for(size_t i = 0; i < 8; i++)
+  Serial.println(UniqueID8[i], HEX);
+```
+
 Do you like this library? Please [star this project on GitHub](https://github.com/ricaun/ArduinoUniqueID/stargazers)!
diff --git a/keywords.txt b/keywords.txt
index 96e46c7..fe6fcad 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -18,4 +18,6 @@ UniqueIDdump	KEYWORD2
 # Constants (LITERAL1)
 #######################################
 
+UniqueID8	LITERAL1
 UniqueID	LITERAL1
+UniqueIDsize	LITERAL1
diff --git a/library.properties b/library.properties
index cc10bc9..73107ce 100644
--- a/library.properties
+++ b/library.properties
@@ -1,9 +1,9 @@
 name=ArduinoUniqueID
-version=1.0.2
+version=1.0.3
 author=Luiz Henrique Cassettari
 maintainer=Luiz Henrique Cassettari <ricaun@gmail.com>
-sentence=Arduino Unique Device ID Library.
-paragraph=Arduino Unique Device ID Library.
+sentence=Arduino Library to get the AVR microcontroler Unique ID / Manufacture Serial Number.
+paragraph=The ArduinoUniqueID Library use the buildin feature to select the manufacture serial number from the microcontroler. Suported / Tested microcontroler: Atmega328pb, Atmega328p, Atmega2560 & Attiny85.
 category=Other
 url=https://github.com/ricaun/ArduinoUniqueID
 architectures=avr
diff --git a/src/ArduinoUniqueID.h b/src/ArduinoUniqueID.h
index 6cc5744..491bf22 100644
--- a/src/ArduinoUniqueID.h
+++ b/src/ArduinoUniqueID.h
@@ -8,6 +8,9 @@
 
 #if __AVR_ARCH__
 #include <avr/boot.h>
+#ifndef SIGRD
+#define SIGRD 5
+#endif
 #else
 #error "ArduinoUniqueID only works on AVR Architecture"
 #endif