diff --git a/src/lib/error.c b/src/lib/error.c
index d5ad2aa..e9fe58f 100644
--- a/src/lib/error.c
+++ b/src/lib/error.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright (C) 2009 John Kacur <jkacur@redhat.com>
+ *
+ * error routines, similar to those found in
+ * Advanced Programming in the UNIX Environment 2nd ed.
+ */
 #include "error.h"
 
 /* Print an error message, plus a message for err and exit with error err */
diff --git a/src/lib/rt-get_cpu.c b/src/lib/rt-get_cpu.c
index 6ebda90..83430dd 100644
--- a/src/lib/rt-get_cpu.c
+++ b/src/lib/rt-get_cpu.c
@@ -1,3 +1,6 @@
+/*
+ * Copyright (C) 2009 John Kacur <jkacur@redhat.com>
+ */
 #include "rt-get_cpu.h"
 #ifdef __NR_getcpu
 #elif defined(__GLIBC__) && defined(__GLIBC_MINOR__)	\
@@ -22,4 +25,3 @@ int get_cpu_setup(void)
 }
 
 #endif
-
diff --git a/src/lib/rt-utils.c b/src/lib/rt-utils.c
index c760f5a..b5a77de 100644
--- a/src/lib/rt-utils.c
+++ b/src/lib/rt-utils.c
@@ -1,3 +1,11 @@
+/*
+ * Copyright (C) 2009 Carsten Emde <carsten.emde@osadl.org>
+ * Copyright (C) 2010 Clark Williams <williams@redhat.com>
+ *
+ * based on functions from cyclictest that has
+ * (C) 2008-2009 Clark Williams <williams@redhat.com>
+ * (C) 2005-2007 Thomas Gleixner <tglx@linutronix.de>
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>