diff --git a/README.md b/README.md
index b44ec40..fab8d53 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 
-# ulid-creator
+# ULID Creator
 
 A Java library for generating and handling ULIDs - _Universally Unique Lexicographically Sortable Identifiers_.
 
@@ -97,7 +97,7 @@ Examples of ULIDs:
 
 ### GUID
 
-The GUIDs in this library are based on the ULID specification <sup>[9]</sup>. The first 48 bits represent the count of milliseconds since Unix Epoch, 1 January 1970. The remaining 60 bits are generated by a secure random number generator.
+The GUIDs in this library are based on the [ULID specification](https://github.com/ulid/spec). The first 48 bits represent the count of milliseconds since Unix Epoch, 1 January 1970. The remaining 60 bits are generated by a secure random number generator.
 
 Every time the timestamp changes the random part is reset to a new random value. If the current timestamp is equal to the previous one, the random bits are incremented by 1.
 
diff --git a/src/main/java/com/github/f4b6a3/ulid/guid/GuidCreator.java b/src/main/java/com/github/f4b6a3/ulid/guid/GuidCreator.java
index ecfe236..28c443d 100644
--- a/src/main/java/com/github/f4b6a3/ulid/guid/GuidCreator.java
+++ b/src/main/java/com/github/f4b6a3/ulid/guid/GuidCreator.java
@@ -193,7 +193,8 @@ public class GuidCreator {
 	/**
 	 * Increment the random part of the GUID.
 	 * 
-	 * An exception is thrown when more than 2^80 increment operations are made.
+	 * An exception is thrown when more than 2^80 increment operations are made
+	 * in the same millisecond.
 	 * 
 	 * @throws UlidCreatorException
 	 *             if an overrun happens.