diff --git a/man5/utmp.5 b/man5/utmp.5
index 3e2aa32c0..b62e76d1c 100644
--- a/man5/utmp.5
+++ b/man5/utmp.5
@@ -74,31 +74,36 @@ struct exit_status {
 };
 
 struct utmp {
-    short ut_type;              /* type of login */
-    pid_t ut_pid;               /* PID of login process */
-    char ut_line[UT_LINESIZE];  /* device name of tty \- "/dev/" */
-    char ut_id[4];              /* init id or abbrev. ttyname */
-    char ut_user[UT_NAMESIZE];  /* user name */
-    char ut_host[UT_HOSTSIZE];  /* hostname for remote login */
-    struct exit_status ut_exit; /* The exit status of a process
-                                   marked as DEAD_PROCESS */
-
+    short   ut_type;              /* Type of record */
+    pid_t   ut_pid;               /* PID of login process */
+    char    ut_line[UT_LINESIZE]; /* device name of tty \- "/dev/" */
+    char    ut_id[4];             /* Terminal name suffix,
+                                     or inittab(5) ID */
+    char    ut_user[UT_NAMESIZE]; /* username */
+    char    ut_host[UT_HOSTSIZE]; /* Hostname for remote login, or
+                                     kernel version for run-level
+                                     messages */
+    struct  exit_status ut_exit;   /* Exit status of a process
+                                     marked as DEAD_PROCESS; not
+				     used by Linux init(8) */
     /* The ut_session and ut_tv fields must be the same size when
        compiled 32- and 64-bit.  This allows data files and shared
-       memory to be shared between 32- and 64-bit applications */
+       memory to be shared between 32- and 64-bit applications. */
 #if __WORDSIZE == 64 && defined __WORDSIZE_COMPAT32
-    int32_t ut_session;         /* Session ID, used for windowing */
+    int32_t ut_session;            /* Session ID, used for windowing */
     struct {
-        int32_t tv_sec;         /* Seconds */
-        int32_t tv_usec;        /* Microseconds */
-    } ut_tv;                    /* Time entry was made */
+        int32_t tv_sec;            /* Seconds */
+        int32_t tv_usec;           /* Microseconds */
+    } ut_tv;                       /* Time entry was made */
 #else
-     long int ut_session;       /* Session ID, used for windowing */
-     struct timeval ut_tv;      /* Time entry was made */
+     long   ut_session;            /* Session ID, used for windowing */
+     struct timeval ut_tv;         /* Time entry was made */
 #endif
 
-    int32_t ut_addr_v6[4];      /* IP address of remote host */
-    char __unused[20];          /* Reserved for future use */
+    int32_t ut_addr_v6[4];         /* Internet address of remote
+                                      host; IPv4 address uses
+                                      just ut_addr_v6[0] */
+    char __unused[20];             /* Reserved for future use */
 };
 
 /* Backwards compatibility hacks.  */