D55750.id173398.diff
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	diff --git a/lib/libsys/sigreturn.2 b/lib/libsys/sigreturn.2
	--- a/lib/libsys/sigreturn.2
	+++ b/lib/libsys/sigreturn.2
	@@ -47,17 +47,25 @@
	restored from the context structure pointed to by
	.Fa scp .
	The system call does not return;
	-the users stack pointer, frame pointer, argument pointer,
	-and processor status longword are restored from the context.
	-Execution resumes at the specified pc.
	-This system call is used by the trampoline code and
	-.Xr longjmp 3
	+the whole userspace context as specified by
	+.Fa scp ,
	+including the users stack pointer, all general purpose registers,
	+coprocessor state, process status register, and program counter
	+are restored from the context.
	+Execution resumes at the program counter from the specified context.
	+.Pp
	+This system call is used by the kernel-provided signal trampoline code,
	+located in the virtual dso (vdso) on some architectures, or as raw code
	+in the shared page if vdso is not provided,
	when returning from a signal to the previously executing program.
	.Sh RETURN VALUES
	If successful, the system call does not return.
	-Otherwise, a value of -1 is returned and
	+Otherwise, a value of -1 may be returned and
	.Va errno
	is set to indicate the error.
	+Some conditions detected by hardware result in the delivery of
	+a synchronous trap signal to the thread, in addition to setting
	+the system call error code.
	.Sh ERRORS
	The
	.Fn sigreturn