1 files changed, 19 insertions, 14 deletions
diff --git a/doc/gawk.texi b/doc/gawk.texi
index fb71bb68..0372897f 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -23256,7 +23256,7 @@ function shell_quote(s,             # parameter
 @end example
 
 @node Isnumeric Function
-@subsection Checking whether a value is numeric
+@subsection Checking Whether A Value Is Numeric
 
 A frequent programming question is how to ascertain whether a value is numeric.
 This can be solved by using this example function @code{isnumeric()}, which
@@ -23271,16 +23271,21 @@ employs the trick of converting a string value to user input by using the
 
 function isnumeric(x,  f)
 @{
-	switch (typeof(x)) @{
-	case "strnum":
-	case "number":
-		return 1
-	case "string":
-		return (split(x, f, " ") == 1) && (typeof(f[1]) == "strnum")
-	default:
-		return 0
-	@}
+    switch (typeof(x)) @{
+    case "strnum":
+    case "number":
+        return 1
+    case "string":
+        return (split(x, f, " ") == 1) && (typeof(f[1]) == "strnum")
+    default:
+        return 0
+    @}
 @}
+
+Please note that leading or trailing white space is disregarded in deciding
+whether a value is numeric or not, so if it matters to you, you may want
+to add an additional check for that.
+
 @c endfile
 @end example
 
@@ -24155,8 +24160,8 @@ $ @kbd{awk -f getopt.awk -v _getopt_test=1 -- -a \}
 @print{} c = <otherd>, Optarg = <>
 @print{} c = <otherc>, Optarg = <>
 @print{} non-option arguments:
-@print{} 	ARGV[8] = <arg1>
-@print{} 	ARGV[9] = <arg2>
+@print{}        ARGV[8] = <arg1>
+@print{}        ARGV[9] = <arg2>
 @end example
 
 In all the runs, the first @option{--} terminates the arguments to
@@ -26353,7 +26358,7 @@ look nice on the page:
 @end ignore
 @c file eg/prog/split.awk
 
-function usage(		common)
+function usage(     common)
 @{
     common = "[-a suffix-len] [file [outname]]"
     printf("usage: split [-l count]  %s\n", common) > "/dev/stderr"
@@ -30186,7 +30191,7 @@ main(void)
         printf("%d\n", x + y); 
     return 0; 
 @} 
-$ @kbd{cc -O add.c -o add}	@ii{Compile the program}
+$ @kbd{cc -O add.c -o add}      @ii{Compile the program}
 @end example
 
 You could then write an exceedingly simple @command{gawk} program