diff --git a/source/Admin/Options_Tabs/Comments.php b/source/Admin/Options_Tabs/Comments.php
new file mode 100644
index 0000000..e7fe804
--- /dev/null
+++ b/source/Admin/Options_Tabs/Comments.php
@@ -0,0 +1,28 @@
+<?php
+namespace Postmatic\Commentium\Admin\Options_Tabs;
+
+use Prompt_Admin_Comment_Options_Tab;
+
+class Comments extends Prompt_Admin_Comment_Options_Tab {
+
+	protected function table_entries() {
+		$entries = parent::table_entries();
+
+		if ( ! $this->options->is_api_transport() ) {
+			return $entries;
+		}
+
+		$entries[2]['title'] = __( 'Comment digests', 'postmatic-premium' );
+		$entries[2]['desc'] = __(
+			'How many comments during a 14 hour period will trigger comment digests to be sent instead of individual comments? There is a minimum of 3.',
+			'postmatic-premium'
+		) . html( 'p',
+			__(
+				'Postmatic automatically combines comment notifications on posts that go viral so your users do not get too many emails. Setting the trigger to 3 comments is good for most sites.',
+				'postmatic-premium'
+			)
+		);
+		
+		return $entries;
+	}
+}
diff --git a/source/Filters/Options.php b/source/Filters/Options.php
new file mode 100644
index 0000000..77e0280
--- /dev/null
+++ b/source/Filters/Options.php
@@ -0,0 +1,19 @@
+<?php
+namespace Postmatic\Commentium\Filters;
+
+/**
+ * Filter option values.
+ */
+class Options {
+
+    /**
+     * Add an option to enable replies only.
+     *
+     * @param array $options
+     * @return array
+     */
+    public static function default_options( array $options = array() ) {
+        $options['enable_replies_only'] = false;
+        return $options;
+    }
+}
diff --git a/source/Filters/Options_Page.php b/source/Filters/Options_Page.php
new file mode 100644
index 0000000..2e99b38
--- /dev/null
+++ b/source/Filters/Options_Page.php
@@ -0,0 +1,48 @@
+<?php
+namespace Postmatic\Commentium\Filters;
+
+use Postmatic\Commentium\Admin\Options_Tabs;
+
+use Prompt_Core;
+
+/**
+ * Filter basic options page items.
+ * @since 1.0.1
+ */
+class Options_Page {
+
+	/**
+	 * Add premium tabs to the basic ones in hard-coded order.
+	 *
+	 * @since 1.0.1
+	 * @param \Prompt_Admin_Options_Tab[] $tabs
+	 * @return \Prompt_Admin_Options_Tab[]
+	 */
+    public static function tabs( $tabs ) {
+        $new_tabs = array();
+
+		foreach( $tabs as $tab ) {
+			$new_tabs[] = $tab;
+			static::maybe_append_tab( $new_tabs );
+		}
+
+		return $new_tabs;
+    }
+
+    /**
+	 * Look at the last tab in a list and decide whether to replace it or add our tabs after it. May change the passed array.
+	 * @since 1.0.1
+	 * @param \Prompt_Admin_Options_Tab[] $tabs
+	 */
+	protected static function maybe_append_tab( &$tabs ) {
+
+		$last_tab = $tabs[count($tabs)-1];
+
+		if ( 'Prompt_Admin_Comment_Options_Tab' === get_class( $last_tab ) and Prompt_Core::$options->is_api_transport() ) {
+			array_pop( $tabs );
+			$tabs[] = new Options_Tabs\Comments( Prompt_Core::$options );
+		}
+
+	}
+
+}
\ No newline at end of file
diff --git a/tests/phpunit/Admin/Options_Tabs/Comments.php b/tests/phpunit/Admin/Options_Tabs/Comments.php
new file mode 100644
index 0000000..27d70a2
--- /dev/null
+++ b/tests/phpunit/Admin/Options_Tabs/Comments.php
@@ -0,0 +1,33 @@
+<?php
+namespace Postmatic\Commentium\Unit_Tests\Admin\Options_Tabs;
+
+use Postmatic\Commentium\Admin\Options_Tabs;
+
+use Prompt_Core;
+use Prompt_Enum_Email_Transports;
+
+use WP_UnitTestCase;
+
+class Comments extends WP_UnitTestCase {
+
+	public function test_render_local() {
+		$tab = new Options_Tabs\Comments( Prompt_Core::$options );
+
+		$content = $tab->render();
+
+		$this->assertContains( 'Comment flood control', $content, 'Expected the old flood control title.' );
+		$this->assertContains( 'comment_flood_control_trigger_count', $content, 'Expected the same flood control field name.' );
+	}
+	
+	public function test_render_api() {
+		Prompt_Core::$options->set( 'email_transport', Prompt_Enum_Email_Transports::API );
+		
+		$tab = new Options_Tabs\Comments( Prompt_Core::$options );
+
+		$content = $tab->render();
+
+		$this->assertContains( 'Comment digests', $content, 'Expected a new flood control title.' );
+		$this->assertContains( 'comment_flood_control_trigger_count', $content, 'Expected the same flood control field name.' );
+	}
+
+}
diff --git a/tests/phpunit/Filters/Options.php b/tests/phpunit/Filters/Options.php
new file mode 100644
index 0000000..a9d74d0
--- /dev/null
+++ b/tests/phpunit/Filters/Options.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Postmatic\Commentium\Unit_Tests\Filters;
+
+use Postmatic\Commentium\Filters;
+
+use \WP_UnitTestCase;
+
+class Options extends WP_UnitTestCase {
+
+	public function test_default_options() {
+		$original_options = array( 'foo' => 'bar' );
+
+		$filtered_options = Filters\Options::default_options( $original_options );
+
+		$this->assertEquals(
+			array_merge( $original_options, array( 'enable_replies_only' => '' ) ),
+			$filtered_options,
+			'Expected custom replies only option to be added.'
+		);
+	}
+
+}
diff --git a/tests/phpunit/Filters/Options_Page.php b/tests/phpunit/Filters/Options_Page.php
new file mode 100644
index 0000000..08781b1
--- /dev/null
+++ b/tests/phpunit/Filters/Options_Page.php
@@ -0,0 +1,43 @@
+<?php
+namespace Postmatic\Commentium\Unit_Tests\Filters;
+
+use Postmatic\Commentium\Filters;
+
+use \WP_UnitTestCase;
+
+class Options_Page extends WP_UnitTestCase {
+
+    public function test_tabs() {
+        $tabs = array(
+            new \Prompt_Admin_Comment_Options_Tab( \Prompt_Core::$options ),
+        );
+
+        $tabs = Filters\Options_Page::tabs( $tabs );
+
+        $this->assertCount( 1, $tabs, 'Expected no tabs to be added.' );
+        $this->assertInstanceOf(
+			'Prompt_Admin_Comment_Options_Tab',
+			$tabs[0],
+			'Expected the original comments tab.'
+		);
+    }
+
+	public function test_premium_replace_tabs() {
+		$tabs = array(
+			new \Prompt_Admin_Comment_Options_Tab( \Prompt_Core::$options ),
+		);
+
+		\Prompt_Core::$options->set( 'enabled_message_types', array( 'post', 'digest' ) );
+		\Prompt_Core::$options->set( 'email_transport', 'api' );
+
+		$tabs = Filters\Options_Page::tabs( $tabs );
+
+        $this->assertCount( 1, $tabs, 'Expected no tabs to be added.' );
+
+		$this->assertInstanceOf(
+			'Postmatic\Commentium\Admin\Options_Tabs\Comments',
+			$tabs[0],
+			'Expected the original comments tab to be replaced.'
+		);
+	}
+}
\ No newline at end of file