diff --git a/apps/vmware/connector/mode/discovery.pm b/apps/vmware/connector/mode/discovery.pm
index 2370134e4..d61e4b7e4 100644
--- a/apps/vmware/connector/mode/discovery.pm
+++ b/apps/vmware/connector/mode/discovery.pm
@@ -77,6 +77,15 @@ Resources discovery.
 
 =over 8
 
+=item B<--resource-type>
+
+Choose the type of resources
+to discover (Can be: 'esx', 'vm') (Mandatory).
+
+=item B<--prettify>
+
+Prettify JSON output.
+
 =back
 
 =cut
diff --git a/cloud/aws/cloudwatch/mode/discovery.pm b/cloud/aws/cloudwatch/mode/discovery.pm
index bff3de4a3..1a37729ab 100644
--- a/cloud/aws/cloudwatch/mode/discovery.pm
+++ b/cloud/aws/cloudwatch/mode/discovery.pm
@@ -33,7 +33,6 @@ sub new {
     
     $self->{version} = '1.0';
     $options{options}->add_options(arguments => {
-        "region:s"      => { name => 'region' },
         "service:s@"    => { name => 'service' },
         "prettify"      => { name => 'prettify' },
     });
@@ -53,11 +52,6 @@ sub check_options {
     my ($self, %options) = @_;
     $self->SUPER::init(%options);
 
-    if (!defined($self->{option_results}->{region}) || $self->{option_results}->{region} eq '') {
-        $self->{output}->add_option_msg(short_msg => "Need to specify --region option.");
-        $self->{output}->option_exit();
-    }
-
     if (!defined($self->{option_results}->{service}) || $self->{option_results}->{service} eq '') {
         $self->{output}->add_option_msg(short_msg => "Need to specify --service option.");
         $self->{output}->option_exit();
@@ -245,6 +239,16 @@ Resources discovery.
 
 =over 8
 
+=item B<--service>
+
+Choose the service from which discover
+resources (Can be: 'VPC', 'EC2', 'RDS',
+'ELB', 'VPN') (Mandatory).
+
+=item B<--prettify>
+
+Prettify JSON output.
+
 =back
 
 =cut
diff --git a/cloud/azure/management/monitor/mode/discovery.pm b/cloud/azure/management/monitor/mode/discovery.pm
index d0c23095f..7a2a0d5fa 100644
--- a/cloud/azure/management/monitor/mode/discovery.pm
+++ b/cloud/azure/management/monitor/mode/discovery.pm
@@ -113,6 +113,26 @@ Resources discovery.
 
 =over 8
 
+=item B<--namespace>
+
+Specify resources namespace.
+
+=item B<--type>
+
+Specify resources type.
+
+=item B<--resource-group>
+
+Specify resources resource group.
+
+=item B<--location>
+
+Specify resources location.
+
+=item B<--prettify>
+
+Prettify JSON output.
+
 =back
 
 =cut
diff --git a/os/linux/local/mode/discoverysnmp.pm b/os/linux/local/mode/discoverysnmp.pm
index e4e65998e..861afc405 100644
--- a/os/linux/local/mode/discoverysnmp.pm
+++ b/os/linux/local/mode/discoverysnmp.pm
@@ -36,7 +36,7 @@ sub new {
     $self->{version} = '1.0';
     $options{options}->add_options(arguments => {
         "subnet:s"              => { name => 'subnet' },
-        "snmp-port:s"           => { name => 'snmp_port' },
+        "snmp-port:s"           => { name => 'snmp_port', default => 161 },
         "snmp-version:s@"       => { name => 'snmp_version' },
         "snmp-community:s@"     => { name => 'snmp_community' },
         "snmp-timeout:s"        => { name => 'snmp_timeout', default => 1 },
@@ -57,10 +57,6 @@ sub check_options {
         $self->{output}->add_option_msg(short_msg => "Need to specify --subnet option (<ip>/<cidr>).");
         $self->{output}->option_exit();
     }
-    if (!defined($self->{option_results}->{snmp_port}) || $self->{option_results}->{snmp_port} eq '') {
-        $self->{output}->add_option_msg(short_msg => "Need to specify --snmp-port option.");
-        $self->{output}->option_exit();
-    }
     if (!defined($self->{option_results}->{snmp_community}) || $self->{option_results}->{snmp_community} eq '') {
         $self->{output}->add_option_msg(short_msg => "Need to specify --snmp-community option.");
         $self->{output}->option_exit();
@@ -196,6 +192,31 @@ Resources discovery.
 
 =over 8
 
+=item B<--subnet>
+
+Specify subnet from which discover
+resources (Must be <ip>/<cidr> format) (Mandatory).
+
+=item B<--snmp-port>
+
+Specify SNMP port (Default: 161).
+
+=item B<--snmp-version>
+
+Specify SNMP version (Can be multiple) (Mandatory).
+
+=item B<--snmp-community>
+
+Specify SNMP community (Can be multiple) (Mandatory).
+
+=item B<--snmp-timeout>
+
+Specify SNMP timeout in second (Default: 1).
+
+=item B<--prettify>
+
+Prettify JSON output.
+
 =back
 
 =cut