diff --git a/man2/sched_setaffinity.2 b/man2/sched_setaffinity.2
index cf7980da3..59de5c808 100644
--- a/man2/sched_setaffinity.2
+++ b/man2/sched_setaffinity.2
@@ -25,11 +25,13 @@
 .\" 2002-11-19 Robert Love <rml@tech9.net> - initial version
 .\" 2004-04-20 mtk - fixed description of return value
 .\" 2004-04-22 aeb - added glibc prototype history
+.\" 2005-05-03 mtk - noted that sched_setaffinity may cause thread 
+.\"	migration and that CPU affinity is a per-thread attribute.
 .\"
 .TH SCHED_SETAFFINITY 2 2005-05-03 "Linux" "Linux Programmer's Manual"
 .SH NAME
-sched_setaffinity, sched_getaffinity \- set and get a process's CPU affinity
-mask
+sched_setaffinity, sched_getaffinity \- set and get a process's CPU
+affinity mask
 .SH SYNOPSIS
 .B #include <sched.h>
 .sp
@@ -48,12 +50,14 @@ is zero, then the current process is used.
 .sp
 The affinity mask is represented by the bitmask stored in
 .IR mask .
-The least significant bit corresponds to the first logical processor number on
-the system, while the most significant bit corresponds to the last logical
-processor number on the system.  A set bit corresponds to a legally schedulable
-CPU while an unset bit corresponds to an illegally schedulable CPU.  In other
-words, a process is bound to and will only run on processors whose
-corresponding bit is set.  Usually, all bits in the mask are set.
+The least significant bit corresponds to the first logical processor
+number on the system, while the most significant bit corresponds to
+the last logical processor number on the system.
+A set bit corresponds to a legally schedulable CPU while an unset
+bit corresponds to an illegally schedulable CPU.
+In other words, a process is bound to and will only run on
+processors whose corresponding bit is set.
+Usually, all bits in the mask are set.
 .sp
 If the process specified by
 .I pid
@@ -103,7 +107,7 @@ is set appropriately.
 A supplied memory address was invalid.
 .TP
 .B EINVAL
-The affinity bitmask 
+The affinity bitmask
 .I mask
 contains no processors that are physically on the system, or the length
 .I len
@@ -122,6 +126,13 @@ capability.
 .TP
 .B ESRCH
 The process whose ID is \fIpid\fR could not be found.
+.SH "NOTES"
+The affinity mask is actually a per-thread attribute that can be
+adjusted independently for each of the threads in a thread group.
+The value returned from a call to
+.BR gettid (2)
+can be passed in the argument
+.IR pid .
 .SH "HISTORY"
 The affinity syscalls were introduced in Linux kernel 2.5.8.
 The library calls were introduced in glibc 2.3, and are still in
@@ -140,7 +151,9 @@ extern int sched_getaffinity (pid_t pid, size_t cpusetsize,
                               cpu_set_t *cpuset);
 .fi
 .SH "SEE ALSO"
+.BR clone (2),
 .BR getpriority (2),
+.BR gettid (2),
 .BR nice (2),
 .BR sched_get_priority_max (2),
 .BR sched_get_priority_min (2),