5 files changed, 29 insertions, 7 deletions
diff --git a/lib/libc/sys/intro.2 b/lib/libc/sys/intro.2
index 45c53469d09..d1575aeb9ea 100644
--- a/lib/libc/sys/intro.2
+++ b/lib/libc/sys/intro.2
@@ -109,11 +109,10 @@ a tape drive is not online or no disk pack is
 loaded on a drive.
 .It Er 7 E2BIG Em "Arg list too long" .
 The number of bytes used for the argument and environment
-list of the new process exceeded the current limit
-of 20480 bytes
-.Pf ( Dv NCARGS
-in
-.Aq Pa sys/param.h ) .
+list of the new process exceeded the limit
+.Pf Dv NCARGS
+(specified in
+.Aq Pa sys/param.h ).
 .It Er 8 ENOEXEC Em "Exec format error" .
 A request was made to execute a file
 that, although it has the appropriate permissions,
@@ -552,8 +551,7 @@ excluding 0 (NUL) and the
 .Tn ASCII
 code for
 .Ql \&/
-(slash).  (The parity bit,
-bit 7, must be 0.)
+(slash).
 .Pp
 Note that it is generally unwise to use
 .Ql \&* ,
diff --git a/lib/libc/sys/madvise.2 b/lib/libc/sys/madvise.2
index d852ef58556..5d18e7ce977 100644
--- a/lib/libc/sys/madvise.2
+++ b/lib/libc/sys/madvise.2
@@ -60,6 +60,12 @@ The known behaviors are given in
 #define	MADV_DONTNEED	4	/* don't need these pages */
 #define	MADV_SPACEAVAIL	5	/* insure that resources are reserved */
 .Ed
+.Sh RETURN VALUES
+Upon successful completion,
+a value of 0 is returned.
+Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
 .Sh SEE ALSO
 .Xr mincore 2 ,
 .Xr minherit 2 ,
diff --git a/lib/libc/sys/mincore.2 b/lib/libc/sys/mincore.2
index 6d4afa6f887..05fb3d6ebd6 100644
--- a/lib/libc/sys/mincore.2
+++ b/lib/libc/sys/mincore.2
@@ -54,6 +54,12 @@ Here the current core residency of the pages is returned
 in the character array 
 .Fa vec ,
 with a value of 1 meaning that the page is in-core.
+.Sh RETURN VALUES
+Upon successful completion,
+a value of 0 is returned.
+Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
 .Sh SEE ALSO
 .Xr madvise 2 ,
 .Xr minherit 2 ,
diff --git a/lib/libc/sys/mprotect.2 b/lib/libc/sys/mprotect.2
index 69a3d28defd..4870751bbc1 100644
--- a/lib/libc/sys/mprotect.2
+++ b/lib/libc/sys/mprotect.2
@@ -52,6 +52,12 @@ changes the specified pages to have protection
 .Fa prot .
 Not all implementations will guarantee protection on a page basis;
 the granularity of protection changes may be as large as an entire region.
+.Sh RETURN VALUES
+Upon successful completion,
+a value of 0 is returned.
+Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
 .Sh SEE ALSO
 .Xr madvise 2 , 
 .Xr mincore 2 , 
diff --git a/lib/libc/sys/msync.2 b/lib/libc/sys/msync.2
index f616ad88a97..8b5f326760a 100644
--- a/lib/libc/sys/msync.2
+++ b/lib/libc/sys/msync.2
@@ -67,6 +67,12 @@ will also take place at this time.
 Filesystem operations on a file that is mapped for shared modifications
 are unpredictable except after an
 .Fn msync .
+.Sh RETURN VALUES
+Upon successful completion,
+a value of 0 is returned.
+Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
 .Sh ERRORS
 The following errors may be reported:
 .Bl -tag -width Er