diff --git a/man2/sigaltstack.2 b/man2/sigaltstack.2
index d98aa5856..aad3f94cf 100644
--- a/man2/sigaltstack.2
+++ b/man2/sigaltstack.2
@@ -70,7 +70,7 @@ typedef struct {
 .RE
 
 To establish a new alternate signal stack,
-\fIss.ss_flags\fP is set to zero, and \fIss.sp_sp\fP and
+\fIss.ss_flags\fP is set to zero, and \fIss.ss_sp\fP and
 \fIss.ss_size\fP specify the starting address and size of
 the stack.
 The constant \fBSIGSTKSZ\fP is defined to be large enough
@@ -78,6 +78,10 @@ to cover the usual size requirements for an alternate signal stack,
 and the constant \fBMINSIGSTKSZ\fP defines the minimum
 size required to execute a signal handler.
 
+When a signal handler is invoked on the alternate stack, 
+the kernel automatically aligns the address given in \fIss.ss_sp\fP 
+to a suitable address bundary for the underlying hardware architecture.
+
 To disable an existing stack, specify \fIss.ss_flags\fP
 as \fBSS_DISABLE\fP.  In this case, the remaining fields
 in \fIss\fP are ignored.
@@ -163,10 +167,10 @@ signal stack.
 .P
 \fBsigaltstack\fP() supersedes the older \fBsigstack\fP() call.
 For backwards compatibility, glibc also provides \fBsigstack\fP().
-All new applications should be written using \fBsigaltstack\fB().
+All new applications should be written using \fBsigaltstack\fP().
 .SH HISTORY
 4.2BSD had a \fIsigstack\fP() system call. It used a slightly
-different struct, and had as major disadvantage that the caller
+different struct, and had the major disadvantage that the caller
 had to know the direction of stack growth.
 .SH "CONFORMING TO"
 SUSv2, SVr4, POSIX 1003.1-2001.