diff --git a/man5/proc.5 b/man5/proc.5
index a9587715e..daffc1e8b 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -1569,7 +1569,8 @@ On 32-bit platforms, 32768 is the maximum value for
 On 64-bit systems,
 .I pid_max
 can be set to any value up to 2^22
-(PID_MAX_LIMIT, approximately 4 million).
+.RB ( PID_MAX_LIMIT ,
+approximately 4 million).
 .\" Prior to 2.6.10, pid_max could also be raised above 32768 on 32-bit
 .\" platforms, but this broke /proc/PID
 .\" See http://marc.theaimsgroup.com/?l=linux-kernel&m=109513010926152&w=2
@@ -1664,7 +1665,8 @@ You can't tune it just yet, but you could change it at
 compile time by editing
 .I include/scsi/sg.h
 and changing
-the value of SG_BIG_BUFF.
+the value of
+.BR SG_BIG_BUFF .
 However, there shouldn't be any reason to change this value.
 .TP
 .I /proc/sys/kernel/shmall
@@ -1677,9 +1679,10 @@ This file
 can be used to query and set the run time limit
 on the maximum (System V IPC) shared memory segment size that can be
 created.
-Shared memory segments up to 1Gb are now supported in the
+Shared memory segments up to 1GB are now supported in the
 kernel.
-This value defaults to SHMMAX.
+This value defaults to
+.BR SHMMAX .
 .TP
 .I /proc/sys/kernel/shmmni
 (available in Linux 2.4 and onwards)