diff --git a/gzguts.h b/gzguts.h
index ab3313a..c226a09 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -1,5 +1,5 @@
 /* gzguts.h -- zlib internal header definitions for gz* operations
- * Copyright (C) 2004, 2005, 2010 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
diff --git a/gzlib.c b/gzlib.c
index 61da8fd..57f79bb 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -1,5 +1,5 @@
 /* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004, 2010 Mark Adler
+ * Copyright (C) 2004, 2010, 2011 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
diff --git a/gzread.c b/gzread.c
index 22eb627..4701f9e 100644
--- a/gzread.c
+++ b/gzread.c
@@ -1,5 +1,5 @@
 /* gzread.c -- zlib functions for reading gzip files
- * Copyright (C) 2004, 2005, 2010 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */