diff --git a/database/iterator.go b/database/iterator.go
index 283ed62..ed23ab5 100644
--- a/database/iterator.go
+++ b/database/iterator.go
@@ -17,46 +17,42 @@ package database
 // iterator until exhaustion. An iterator is not safe for concurrent use, but it
 // is safe to use multiple iterators concurrently.
 type Iterator interface {
-	// Next moves the iterator to the next key/value pair. It returns whether the
-	// iterator is exhausted.
+	// Next moves the iterator to the next key/value pair. It returns whether
+	// the iterator is exhausted.
 	Next() bool
 
 	// Error returns any accumulated error. Exhausting all the key/value pairs
 	// is not considered to be an error.
 	Error() error
 
-	// Key returns the key of the current key/value pair, or nil if done. The caller
-	// should not modify the contents of the returned slice, and its contents may
-	// change on the next call to Next.
+	// Key returns the key of the current key/value pair, or nil if done.
 	Key() []byte
 
-	// Value returns the value of the current key/value pair, or nil if done. The
-	// caller should not modify the contents of the returned slice, and its contents
-	// may change on the next call to Next.
+	// Value returns the value of the current key/value pair, or nil if done.
 	Value() []byte
 
-	// Release releases associated resources. Release should always succeed and can
-	// be called multiple times without causing error.
+	// Release releases associated resources. Release should always succeed and
+	// can be called multiple times without causing error.
 	Release()
 }
 
 // Iteratee wraps the NewIterator methods of a backing data store.
 type Iteratee interface {
-	// NewIterator creates a binary-alphabetical iterator over the entire keyspace
-	// contained within the key-value database.
+	// NewIterator creates a binary-alphabetical iterator over the entire
+	// keyspace contained within the key-value database.
 	NewIterator() Iterator
 
-	// NewIteratorWithStart creates a binary-alphabetical iterator over a subset of
-	// database content starting at a particular initial key (or after, if it does
-	// not exist).
+	// NewIteratorWithStart creates a binary-alphabetical iterator over a subset
+	// of database content starting at a particular initial key (or after, if it
+	// does not exist).
 	NewIteratorWithStart(start []byte) Iterator
 
-	// NewIteratorWithPrefix creates a binary-alphabetical iterator over a subset
-	// of database content with a particular key prefix.
+	// NewIteratorWithPrefix creates a binary-alphabetical iterator over a
+	// subset of database content with a particular key prefix.
 	NewIteratorWithPrefix(prefix []byte) Iterator
 
-	// NewIteratorWithStartAndPrefix creates a binary-alphabetical iterator over a
-	// subset of database content with a particular key prefix starting at a
+	// NewIteratorWithStartAndPrefix creates a binary-alphabetical iterator over
+	// a subset of database content with a particular key prefix starting at a
 	// specified key.
 	NewIteratorWithStartAndPrefix(start, prefix []byte) Iterator
 }