diff --git a/Changes b/Changes
index 6ed54c3..68dc7b0 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,6 @@
 0.05
  - Add -f option to print frequency.
+ - Add support for leader.
  - Improve doc in marc-list.
  - Remove pointless uniq from code.
 
diff --git a/List.pm b/List.pm
index d2cd8de..19c87fa 100644
--- a/List.pm
+++ b/List.pm
@@ -45,7 +45,7 @@ sub run {
 		print STDERR "\t-h\t\tPrint help.\n";
 		print STDERR "\t--version\tPrint version.\n";
 		print STDERR "\tmarc_xml_file\tMARC XML file.\n";
-		print STDERR "\tfield\t\tMARC field.\n";
+		print STDERR "\tfield\t\tMARC field (field number or 'leader' string).\n";
 		print STDERR "\tsubfield\tMARC subfield (for datafields).\n";
 		return 1;
 	}
@@ -53,7 +53,8 @@ sub run {
 	$self->{'_marc_field'} = shift @ARGV;
 	$self->{'_marc_subfield'} = shift @ARGV;
 
-	if (int($self->{'_marc_field'}) > 9
+	if ($self->{'_marc_field'} ne 'leader'
+		&& int($self->{'_marc_field'}) > 9
 		&& ! defined $self->{'_marc_subfield'}) {
 
 		err 'Subfield is required.';
@@ -82,16 +83,21 @@ sub run {
 		}
 		$previous_record = $record;
 
-		my @fields = $record->field($self->{'_marc_field'});
-		foreach my $field (@fields) {
-			if (defined $self->{'_marc_subfield'}) {
-				my @subfield_values = $field->subfield($self->{'_marc_subfield'});
-				foreach my $subfield_value (@subfield_values) {
-					$ret_hr->{$subfield_value}++;
+		if ($self->{'_marc_field'} eq 'leader') {
+			my $leader = $record->leader;
+			$ret_hr->{"'".$leader."'"}++;
+		} else {
+			my @fields = $record->field($self->{'_marc_field'});
+			foreach my $field (@fields) {
+				if (defined $self->{'_marc_subfield'}) {
+					my @subfield_values = $field->subfield($self->{'_marc_subfield'});
+					foreach my $subfield_value (@subfield_values) {
+						$ret_hr->{$subfield_value}++;
+					}
+				} else {
+					my $data = $field->data;
+					$ret_hr->{$data}++;
 				}
-			} else {
-				my $data = $field->data;
-				$ret_hr->{$data}++;
 			}
 		}
 		$num++;
diff --git a/TODO b/TODO
index 2baa577..79f6016 100644
--- a/TODO
+++ b/TODO
@@ -2,7 +2,6 @@ TODO
 ====
 3. Support multiple params. marc-list 490 a 490 b
 4. Fix message of issue with MARC record.
-5. Add support for leader.
 7. Add check for input field (field or leader string).
 8.
 
@@ -17,3 +16,6 @@ OK [20220518] skim
 
 6. Add freq to output structure. Add option to sort via freq.
 OK [20250128] skim
+
+5. Add support for leader.
+OK [20250128] skim
diff --git a/t/App-MARC-List/04-run.t b/t/App-MARC-List/04-run.t
index e4efed1..d2c58d0 100644
--- a/t/App-MARC-List/04-run.t
+++ b/t/App-MARC-List/04-run.t
@@ -6,7 +6,7 @@ use English;
 use Error::Pure::Utils qw(clean);
 use File::Object;
 use File::Spec::Functions qw(abs2rel);
-use Test::More 'tests' => 12;
+use Test::More 'tests' => 13;
 use Test::NoWarnings;
 use Test::Output;
 use Test::Warn;
@@ -143,6 +143,23 @@ stdout_is(
 	'Run list for MARC XML file with 1 record (260b, with frequency).',
 );
 
+# Test.
+@ARGV = (
+	$data_dir->file('ex3.xml')->s,
+	'leader',
+);
+$right_ret = <<'END';
+'     nam a22        4500'
+END
+stdout_is(
+	sub {
+		App::MARC::List->new->run;
+		return;
+	},
+	$right_ret,
+	'Run list for MARC XML file with 1 record (260b, with frequency).',
+);
+
 # Test.
 @ARGV = (
 	$data_dir->file('ex2.xml')->s,
@@ -181,7 +198,7 @@ Usage: $script [-f] [-h] [--version] marc_xml_file field [subfield]
 	-h		Print help.
 	--version	Print version.
 	marc_xml_file	MARC XML file.
-	field		MARC field.
+	field		MARC field (field number or 'leader' string).
 	subfield	MARC subfield (for datafields).
 END