diff --git a/Changes b/Changes
index 23dae69cd..792555360 100644
--- a/Changes
+++ b/Changes
@@ -14,6 +14,9 @@ Apologies if I missed anyone!
 Global changes
 --------------
 
+Most instances of the constant "NULL" are not formatted (bolded) in 
+man pages, but a few are.  For consistency, formatting on "NULL" has i
+been removed where it occurred.
 
 Typographical or grammatical errors have been corrected in several
 places.
@@ -26,3 +29,6 @@ New pages
 Changes to individual pages
 ---------------------------
 
+mkfifo.3
+    mtk
+        Minor change to RETURN VALUE text.
diff --git a/man2/fcntl.2 b/man2/fcntl.2
index 4e3578b0b..2f4f34882 100644
--- a/man2/fcntl.2
+++ b/man2/fcntl.2
@@ -323,7 +323,9 @@ Because of the buffering performed by the
 .BR stdio (3)
 library, the use of record locking with routines in that package
 should be avoided; use
-.BR read "(2) and " write (2)
+.BR read (2)
+and 
+.BR write (2)
 instead.
 .P
 .SS "Mandatory locking"
diff --git a/man2/flock.2 b/man2/flock.2
index 5c059147c..c0df39f50 100644
--- a/man2/flock.2
+++ b/man2/flock.2
@@ -73,7 +73,9 @@ Locks created by
 .BR flock ()
 are associated with an open file table entry.
 This means that duplicate file descriptors (created by, for example,
-.BR fork "(2) or " dup (2))
+.BR fork (2) 
+or
+.BR dup (2))
 refer to the same lock, and this lock may be modified
 or released using any of these descriptors.
 Furthermore, the lock is released either by an explicit
diff --git a/man2/posix_fadvise.2 b/man2/posix_fadvise.2
index 7db24f77c..6e569b909 100644
--- a/man2/posix_fadvise.2
+++ b/man2/posix_fadvise.2
@@ -115,4 +115,5 @@ In kernels before 2.6.6, if
 was specified as 0, then this was interpreted literally as "zero bytes",
 rather than as meaning "all bytes through to the end of the file".
 .SH "SEE ALSO"
-.BR posix_fallocate "(2), " posix_madvise "(2)."
+.BR posix_fallocate (2), 
+.BR posix_madvise (2).
diff --git a/man3/getopt.3 b/man3/getopt.3
index 5cbebd601..d5558dbd2 100644
--- a/man3/getopt.3
+++ b/man3/getopt.3
@@ -184,7 +184,7 @@ is:
 .TP
 .I flag
 specifies how results are returned for a long option.  If \fIflag\fP
-is \fBNULL\fP, then \fBgetopt_long\fP() returns \fIval\fP.  (For
+is NULL, then \fBgetopt_long\fP() returns \fIval\fP.  (For
 example, the calling program may set \fIval\fP to the equivalent short
 option character.)  Otherwise, \fBgetopt_long\fP() returns 0, and
 \fIflag\fP points to a variable which is set to \fIval\fP if the
@@ -196,7 +196,7 @@ to by \fIflag\fP.
 .PP
 The last element of the array has to be filled with zeroes.
 .PP
-If \fIlongindex\fP is not \fBNULL\fP, it
+If \fIlongindex\fP is not NULL, it
 points to a variable which is set to the index of the long option relative to
 .IR longopts .
 .PP
@@ -225,7 +225,7 @@ if it is ':', then ':' is returned; otherwise '?' is returned.
 .PP
 \fBgetopt_long\fP() and \fBgetopt_long_only\fP() also return the option
 character when a short option is recognized.  For a long option, they
-return \fIval\fP if \fIflag\fP is \fBNULL\fP, and 0 otherwise.  Error
+return \fIval\fP if \fIflag\fP is NULL, and 0 otherwise.  Error
 and \-1 returns are the same as for \fBgetopt\fP() (), plus '?' for an
 ambiguous match or an extraneous parameter.
 .SH "ENVIRONMENT VARIABLES"
diff --git a/man3/hsearch.3 b/man3/hsearch.3
index 4c06a0e0f..b0705db98 100644
--- a/man3/hsearch.3
+++ b/man3/hsearch.3
@@ -87,7 +87,7 @@ and if successful returns a pointer to it.
 The argument \fIaction\fP determines what \fBhsearch\fP() does
 after an unsuccessful search.  A value of \fBENTER\fP instructs it to
 insert a copy of \fIitem\fP, while a value of \fBFIND\fP means to return
-\fBNULL\fP.
+NULL.
 .PP
 The three functions
 .BR hcreate_r (),
@@ -101,7 +101,7 @@ must be zeroed before the first call to
 \fBhcreate\fP() and \fBhcreate_r\fP() return 0 when allocation of the memory
 for the hash table fails, non-zero otherwise.
 .LP
-\fBhsearch\fP() returns \fBNULL\fP if \fIaction\fP is \fBENTER\fP and
+\fBhsearch\fP() returns NULL if \fIaction\fP is \fBENTER\fP and
 the hash table is full, or \fIaction\fP is \fBFIND\fP and \fIitem\fP
 cannot be found in the hash table.
 .LP
diff --git a/man3/lsearch.3 b/man3/lsearch.3
index 71b267832..08a1b5fe2 100644
--- a/man3/lsearch.3
+++ b/man3/lsearch.3
@@ -55,7 +55,7 @@ In particular, one should know that a matching element
 exists, or that more room is available.
 .SH "RETURN VALUE"
 \fBlfind\fP() returns a pointer to a matching member of the array, or
-\fBNULL\fP if no match is found.  \fBlsearch\fP() returns a pointer to
+NULL if no match is found.  \fBlsearch\fP() returns a pointer to
 a matching member of the array, or to the newly added member if no
 match is found.
 .SH "CONFORMING TO"
diff --git a/man3/mkdtemp.3 b/man3/mkdtemp.3
index 9b0023582..c715b6821 100644
--- a/man3/mkdtemp.3
+++ b/man3/mkdtemp.3
@@ -42,7 +42,7 @@ Since it will be modified,
 must not be a string constant, but should be declared as a character array.
 .SH "RETURN VALUE"
 The \fBmkdtemp\fP() function returns a pointer to the modified template
-string on success, and \fBNULL\fP on failure, in which case
+string on success, and NULL on failure, in which case
 .IR errno
 is set appropriately.
 .SH ERRORS
diff --git a/man3/strptime.3 b/man3/strptime.3
index 806b422ed..e14133873 100644
--- a/man3/strptime.3
+++ b/man3/strptime.3
@@ -262,7 +262,7 @@ value points right after the last consumed input character.  In case
 the whole input string is consumed the return value points to the NUL
 byte at the end of the string.  If \fBstrptime\fP() fails to match all
 of the format string and therefore an error occurred the function
-returns \fBNULL\fP.
+returns NULL.
 .SH "CONFORMING TO"
 XPG4, SUSv2, POSIX 1003.1-2001.
 .SH EXAMPLE
diff --git a/man3/strsignal.3 b/man3/strsignal.3
index 120fb1ae5..0c17c6128 100644
--- a/man3/strsignal.3
+++ b/man3/strsignal.3
@@ -49,7 +49,7 @@ used if possible instead of this array.
 .SH "RETURN VALUE"
 The \fBstrsignal\fP() function returns the appropriate description
 string, or an unknown signal message if the signal number is invalid.
-On some systems (but not on Linux), a \fBNULL\fP pointer may be
+On some systems (but not on Linux), a NULL pointer may be
 returned instead for an invalid signal number.
 .SH "CONFORMING TO"
 This function is not part of any standard, but may be found on Linux
diff --git a/man3/tsearch.3 b/man3/tsearch.3
index 7cd34c191..06e993687 100644
--- a/man3/tsearch.3
+++ b/man3/tsearch.3
@@ -61,13 +61,13 @@ equal to, or greater than the second.
 \fBtsearch\fP() searches the tree for an item.  \fIkey\fP 
 points to the item to be searched for.  \fIrootp\fP points to a
 variable which points to the root of the tree.  If the tree is empty,
-then the variable that \fIrootp\fP points to should be set to \fBNULL\fP.
+then the variable that \fIrootp\fP points to should be set to NULL.
 If the item is found in the tree, then \fBtsearch\fP() returns a pointer
 to it.  If it is not found, then \fBtsearch\fP() adds it, and returns a
 pointer to the newly added item.
 .PP
 \fBtfind\fP() is like \fBtsearch\fP(), except that if the item is not
-found, then \fBtfind\fP() returns \fBNULL\fP.
+found, then \fBtfind\fP() returns NULL.
 .PP
 \fBtdelete\fP() deletes an item from the tree.  Its arguments are the
 same as for \fBtsearch\fP().  
@@ -100,17 +100,17 @@ no such work is necessary \fIfree_node\fP must point to a function
 doing nothing.
 .SH "RETURN VALUE"
 \fBtsearch\fP() returns a pointer to a matching item in the tree, or to
-the newly added item, or \fBNULL\fP if there was insufficient memory
+the newly added item, or NULL if there was insufficient memory
 to add the item.  \fBtfind\fP() returns a pointer to the item, or
-\fBNULL\fP if no match is found.  If there
+NULL if no match is found.  If there
 are multiple elements that match the key, the element returned is
 unspecified.
 .PP
 \fBtdelete\fP() returns a pointer to the parent of the item deleted, or
-\fBNULL\fP if the item was not found.
+NULL if the item was not found.
 .PP
 \fBtsearch\fP(), \fBtfind\fP(), and \fBtdelete\fP() also
-return \fBNULL\fP if \fIrootp\fP was \fBNULL\fP on entry.  
+return NULL if \fIrootp\fP was NULL on entry.  
 .SH WARNINGS
 \fBtwalk\fP() takes a pointer to the root, while the other functions
 take a pointer to a variable which points to the root.
diff --git a/man3/ttyname.3 b/man3/ttyname.3
index 4b1f1a17b..af86d7de4 100644
--- a/man3/ttyname.3
+++ b/man3/ttyname.3
@@ -38,7 +38,7 @@ ttyname, ttyname_r \- return name of a terminal
 The function
 .BR ttyname ()
 returns a pointer to the NUL-terminated pathname of the terminal device
-that is open on the file descriptor \fIfd\fP, or \fBNULL\fP on error
+that is open on the file descriptor \fIfd\fP, or NULL on error
 (for example, if \fIfd\fP is not connected to a terminal).
 The return value may point to static data, possibly overwritten by the
 next call.
diff --git a/man4/console_ioctl.4 b/man4/console_ioctl.4
index 42bb8cb37..ee154acab 100644
--- a/man4/console_ioctl.4
+++ b/man4/console_ioctl.4
@@ -162,7 +162,7 @@ invalidates the Unicode mapping.  (Since 1.3.1.)
 
 .IP \fBPIO_FONTRESET\fP
 Resets the screen font, size and Unicode mapping to the bootup
-defaults.  \fIargp\fP is unused, but should be set to \fBNULL\fP to
+defaults.  \fIargp\fP is unused, but should be set to NULL to
 ensure compatibility with future versions of Linux.  (Since 1.3.28.)
 
 .IP \fBGIO_SCRNMAP\fP