diff --git a/README.md b/README.md
index 92814a8..96b71dc 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Performance data is also enhanced to extract performance data compliant to Nagio
 
 Usage: 
 ```
-check_json -u|--url <URL> -a|--attribute <attribute> [ -c|--critical <threshold> ] [ -w|--warning <threshold> ] [ -p|--perfvars <fields> ] [ -t|--timeout <timeout> ] [ -d|--divisor <divisor> ] [ -h|--help ]
+check_json -u|--url <URL> -a|--attribute <attribute> [ -c|--critical <threshold> ] [ -w|--warning <threshold> ] [ -p|--perfvars <fields> ] [ -t|--timeout <timeout> ] [ -d|--divisor <divisor> ] [ -T|--contenttype <content-type> ] [ -h|--help ]
 ```
 
 Example: 
@@ -22,3 +22,9 @@ Result:
 Check JSON status API OK - dead_shares: 2, live_shares: 12, clients_connected: 234 | dead_shares=2;5;10 live_shares=12 clients_connected=234
 ```
 
+Requirements
+============
+
+Perl JSON package
+
+* Debian : libjson-perl
diff --git a/check_json.pl b/check_json.pl
index 638e880..2566382 100755
--- a/check_json.pl
+++ b/check_json.pl
@@ -13,6 +13,7 @@ my $np = Nagios::Plugin->new(
     . "[ -p|--perfvars <fields> ] "
     . "[ -t|--timeout <timeout> ] "
     . "[ -d|--divisor <divisor> ] "
+    . "[ -T|--contenttype <content-type> ] "
     . "[ -h|--help ] ",
     version => '0.2',
     blurb   => 'Nagios plugin to check JSON attributes via http(s)',
@@ -52,12 +53,20 @@ $np->add_arg(
     . 'http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT '
     . 'for the threshold format. ',
 );
+
 $np->add_arg(
     spec => 'perfvars|p=s',
     help => '-p, --perfvars . CSV list of fields from JSON response to include in perfdata '
     . '{shares}->{dead},{shares}->{live}',
 );
 
+$np->add_arg(
+    spec => 'contenttype|T=s',
+    default => 'application/json',
+    help => '-T, --contenttype . content-type accepted if different from application/json ',
+);
+
+
 ## Parse @ARGV and process standard arguments (e.g. usage, help, version)
 $np->getopts;
 if ($np->opts->verbose) { (print Dumper ($np))};
@@ -75,7 +84,7 @@ if ($np->opts->verbose) { (print Dumper ($ua))};
 my $response = ($ua->get($np->opts->url));
 
 if ($response->is_success) {
-    if (!($response->header("content-type") =~ 'application/json')) {
+    if (!($response->header("content-type") =~ $np->opts->contenttype)) {
         $np->nagios_exit(UNKNOWN,"Content type is not JSON: ".$response->header("content-type"));
     }
 } else {