diff --git a/man2/syscalls.2 b/man2/syscalls.2
index 597559314..fe8f5c2d0 100644
--- a/man2/syscalls.2
+++ b/man2/syscalls.2
@@ -205,6 +205,7 @@ System call	Kernel	Notes
 \fBgetuid\fP(2)
 \fBgetuid32\fP(2)	2.4
 \fBgetxattr\fP(2)	2.6; 2.4.18
+.\" \fBgetunwind\fP(2)	???	i164; DEPRECATE
 \fBgtty\fP(2)
 \fBidle\fP(2)
 \fBinit_module\fP(2)
@@ -273,6 +274,8 @@ System call	Kernel	Notes
 \fBmsgrcv\fP(2)
 \fBmsgsnd\fP(2)
 \fBmsync\fP(2)
+.\" \fBmultiplexer\fP(2)	??	__NR_multiplexer reserved on
+.\"		PowerPC, but unimplemented?
 \fBmunlock\fP(2)
 \fBmunlockall\fP(2)
 \fBmunmap\fP(2)
@@ -426,6 +429,7 @@ System call	Kernel	Notes
 \fBsymlinkat\fP(2)	2.6.16
 \fBsync\fP(2)
 \fBsync_file_range\fP(2)	2.6.17
+.\" \fBsys_debug_setcontext\fP(2)	???	PowerPC if CONFIG_PPC32
 \fBsysfs\fP(2)
 \fBsysinfo\fP(2)
 \fBsyslog\fP(2)		glibc interface is \fBklogctl\fP(3)
@@ -442,6 +446,8 @@ System call	Kernel	Notes
 \fBtkill\fP(2)	2.6; 2.4.22
 \fBtruncate\fP(2)
 \fBtruncate64\fP(2)	2.4
+\fBtuxcall\fP(2)		Unimplemented; no slot on i386
+.\" As at 2.6.22, tuxcall has a slot on PowerPC, Xx86_64, and alpha
 \fBugetrlimit\fP(2)	2.4
 \fBulimit\fP(2)		Implemented in glibc;
 		see \fBulimit\fP(3)
@@ -504,6 +510,7 @@ the following system calls are not implemented in the standard kernel:
 .\" __NR_putpmsg is 223 on Linux 2.4/i386; absent on 2.6/i386, present
 .\" on a a couple og 2.6 architectures
 .BR stty (2),        \" __NR_stty is 31 on Linux 2.6.22/i386
+.BR tuxcall (2),     \" __NR_tuxcall is 184 on x86_64, also on PPC and alpha
 .BR ulimit (2),      \" __NR_ulimit is 58 on Linux 2.6.22/i386
 and
 .BR vserver (2)      \" __NR_vserver is 273 on Linux 2.6.22/i386