diff --git a/src/catools/camonitor.c b/src/catools/camonitor.c
index cda00989f..307dad8d6 100644
--- a/src/catools/camonitor.c
+++ b/src/catools/camonitor.c
@@ -42,45 +42,49 @@ static int nConn = 0;                                     /* Number of connected
 
 void usage (void)
 {
-    fprintf (stderr, "\nUsage: camonitor [options] <PV name> ...\n\n"
-    "  -h: Help: Print this message\n"
+    fprintf (stderr, "\nUsage: camonitor [options] <PV name> ...\n"
+    "\n"
+    "  -h:       Help; Print this message\n"
     "Channel Access options:\n"
-    "  -w <sec>:  Wait time, specifies CA timeout, default is %f second(s)\n"
-    "  -m <mask>: Specify CA event mask to use, with <mask> being any combination of\n"
-    "             'v' (value), 'a' (alarm), 'l' (log/archive), 'p' (property). Default: va\n"
-    "  -p <prio>: CA priority (0-%u, default 0=lowest)\n"
+    "  -w <sec>: Wait time, specifies CA timeout, default is %f second(s)\n"
+    "  -m <msk>: Specify CA event mask to use.  <msk> is any combination of\n"
+    "            'v' (value), 'a' (alarm), 'l' (log/archive), 'p' (property).\n"
+    "            Default event mask is 'va'\n"
+    "  -p <pri>: CA priority (0-%u, default 0=lowest)\n"
     "Timestamps:\n"
-    "  Default: Print absolute timestamps (as reported by CA server)\n"
-    "  -t <key>:  Specify timestamp source(s) and type, with <key> containing\n"
-    "             's' = CA server (remote) timestamps\n"
-    "             'c' = CA client (local) timestamps (shown in '()'s)\n"
-    "             'n' = no timestamps\n"
-    "             'r' = relative timestamps (time elapsed since start of program)\n"
-    "             'i' = incremental timestamps (time elapsed since last update)\n"
-    "             'I' = incremental timestamps (time elapsed since last update, by channel)\n"
+    "  Default:  Print absolute timestamps (as reported by CA server)\n"
+    "  -t <key>: Specify timestamp source(s) and type, with <key> containing\n"
+    "            's' = CA server (remote) timestamps\n"
+    "            'c' = CA client (local) timestamps (shown in '()'s)\n"
+    "            'n' = no timestamps\n"
+    "            'r' = relative timestamps (time elapsed since start of program)\n"
+    "            'i' = incremental timestamps (time elapsed since last update)\n"
+    "            'I' = incremental timestamps (time since last update, by channel)\n"
+    "            'r', 'i' or 'I' require 's' or 'c' to select the time source\n"
     "Enum format:\n"
-    "  -n: Print DBF_ENUM values as number (default are enum string values)\n"
-    "Arrays: Value format: print number of requested values, then list of values\n"
-    "  Default:    Print all values\n"
-    "  -# <count>: Print first <count> elements of an array\n"
-    "  -S:         Print array of char as a string (long string)\n"
-    "Floating point type format:\n"
-    "  Default: Use %%g format\n"
-    "  -e <nr>: Use %%e format, with a precision of <nr> digits\n"
-    "  -f <nr>: Use %%f format, with a precision of <nr> digits\n"
-    "  -g <nr>: Use %%g format, with a precision of <nr> digits\n"
-    "  -s:      Get value as string (honors server-side precision)\n"
-    "  -lx:     Round to long integer and print as hex number\n"
-    "  -lo:     Round to long integer and print as octal number\n"
-    "  -lb:     Round to long integer and print as binary number\n"
+    "  -n:       Print DBF_ENUM values as number (default is enum string)\n"
+    "Array values: Print number of elements, then list of values\n"
+    "  Default:  Request and print all elements (dynamic arrays supported)\n"
+    "  -# <num>: Request and print up to <num> elements\n"
+    "  -S:       Print arrays of char as a string (long string)\n"
+    "Floating point format:\n"
+    "  Default:  Use %%g format\n"
+    "  -e <num>: Use %%e format, with a precision of <num> digits\n"
+    "  -f <num>: Use %%f format, with a precision of <num> digits\n"
+    "  -g <num>: Use %%g format, with a precision of <num> digits\n"
+    "  -s:       Get value as string (honors server-side precision)\n"
+    "  -lx:      Round to long integer and print as hex number\n"
+    "  -lo:      Round to long integer and print as octal number\n"
+    "  -lb:      Round to long integer and print as binary number\n"
     "Integer number format:\n"
-    "  Default: Print as decimal number\n"
-    "  -0x: Print as hex number\n"
-    "  -0o: Print as octal number\n"
-    "  -0b: Print as binary number\n"
+    "  Default:  Print as decimal number\n"
+    "  -0x:      Print as hex number\n"
+    "  -0o:      Print as octal number\n"
+    "  -0b:      Print as binary number\n"
     "Alternate output field separator:\n"
-    "  -F <ofs>: Use <ofs> as an alternate output field separator\n"
-    "\nExample: camonitor -f8 my_channel another_channel\n"
+    "  -F <ofs>: Use <ofs> to separate fields in output\n"
+    "\n"
+    "Example: camonitor -f8 my_channel another_channel\n"
     "  (doubles are printed as %%f with precision of 8)\n\n"
              , DEFAULT_TIMEOUT, CA_PRIORITY_MAX);
 }