diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18a635e..3e56802 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - call backtraces to SQL records and HTTP calls
 - new format of hook events
 - sidebar tracking
+- list of callbacks to hook events
 
 ### Changed
 - required PHP version to 7.1
diff --git a/src/Event/Core_Events.php b/src/Event/Core_Events.php
index 5895ff2..9e5938c 100644
--- a/src/Event/Core_Events.php
+++ b/src/Event/Core_Events.php
@@ -27,7 +27,7 @@ class Core_Events implements Hook_Event_Config_Interface {
 			[ 'Main Loop', 'theme', 'loop_start', 'loop_end' ],
 			[ 'Sidebar', 'theme', 'dynamic_sidebar_before', 'dynamic_sidebar_after' ],
 			[ 'Toolbar', 'core', 'admin_bar_menu', '' ],
-			[ 'Footer Hook', 'theme', 'wp_footer', '' ],
+			[ 'Footer Hook', 'theme', 'wp_footer' ],
 		];
 	}
 }
diff --git a/src/Formatter/Hook_Formatter.php b/src/Formatter/Hook_Formatter.php
new file mode 100644
index 0000000..b75cdef
--- /dev/null
+++ b/src/Formatter/Hook_Formatter.php
@@ -0,0 +1,61 @@
+<?php
+declare( strict_types=1 );
+
+namespace Rarst\Laps\Formatter;
+
+/**
+ * Formatter to process callbacks from a hook instance.
+ */
+class Hook_Formatter {
+
+	/**
+	 * @param \WP_Hook|array $hook
+	 *
+	 * @return array
+	 */
+	public function format($hook): array {
+
+		$callbacks = [];
+
+		if ( $hook instanceof \WP_Hook ) {
+			$hook = $hook->callbacks;
+		}
+		ksort( $hook );
+
+		foreach ( $hook as $priority => $functions ) {
+			foreach ( $functions as $function ) {
+				$callback = $function['function'];
+
+				if ( is_string( $callback ) ) {
+
+				} elseif ( is_a( $callback, 'Closure' ) ) {
+					$closure  = new \ReflectionFunction( $callback );
+					$callback = 'closure from ' . $closure->getFileName() . '::' . $closure->getStartLine();
+
+					if ( false !== strpos( $callback, 'Hook_Record_Collector' ) ) {
+						continue;
+					}
+				} elseif ( is_object( $callback ) ) {
+					$class = new \ReflectionClass( $callback );
+					$name  = $class->getName();
+					if ( 0 === strpos( $name, 'class@anonymous' ) ) {
+						$callback = 'anonymous class from ' . $class->getFileName() . '::' . $class->getStartLine();
+					} else {
+						$callback = $name;
+					}
+				} elseif ( is_string( $callback[0] ) ) { // Static method call.
+					$callback = $callback[0] . '::' . $callback[1];
+				} elseif ( is_object( $callback[0] ) ) {
+					$callback = get_class( $callback[0] ) . '->' . $callback[1];
+				}
+
+				$callback .= ( 1 === (int) $function['accepted_args'] ) ? '' : "({$function['accepted_args']})";
+
+				$callbacks[] = $callback;
+			}
+		}
+
+		return $callbacks;
+	}
+}
+
diff --git a/src/Record/Hook_Record_Collector.php b/src/Record/Hook_Record_Collector.php
index 3ce20a4..a81c65f 100644
--- a/src/Record/Hook_Record_Collector.php
+++ b/src/Record/Hook_Record_Collector.php
@@ -4,7 +4,9 @@ declare( strict_types=1 );
 namespace Rarst\Laps\Record;
 
 use Rarst\Laps\Event\Hook_Event_Config_Interface;
+use Rarst\Laps\Formatter\Hook_Formatter;
 use Symfony\Component\Stopwatch\Stopwatch;
+use Symfony\Component\Stopwatch\StopwatchEvent;
 
 /**
  * Processes events based on hooked starts and stops.
@@ -17,6 +19,12 @@ class Hook_Record_Collector extends Stopwatch_Record_Collector {
 	/** @var array $events */
 	protected $events = [];
 
+	/** @var array */
+	protected $callbacks = [];
+
+	/** @var Hook_Formatter */
+	protected $formatter;
+
 	/**
 	 * @param Stopwatch                     $stopwatch     Stopwatch instance.
 	 * @param Hook_Event_Config_Interface[] $event_configs Starts and stops configuration.
@@ -31,6 +39,8 @@ class Hook_Record_Collector extends Stopwatch_Record_Collector {
 		$this->event_configs = $event_configs;
 
 		add_action( 'after_setup_theme', [ $this, 'after_setup_theme' ], 15 );
+
+		$this->formatter = new Hook_Formatter();
 	}
 
 	/**
@@ -84,12 +94,17 @@ class Hook_Record_Collector extends Stopwatch_Record_Collector {
 		}
 
 		if ( '' !== $start ) {
-			add_action( $start, function ( $input = null ) use ( $event, $category ) {
+			add_action( $start, function ( $input = null ) use ( $event, $category, $start, $stop ) {
 
 				if ( 'Sidebar' === $event ) {
 					$event = $input;
 				}
 
+				if ( $start === $stop ) {
+					global $wp_filter;
+					$this->callbacks[ $event ] = $wp_filter[ $start ];
+				}
+
 				$this->start( $event, $category );
 
 				return $input;
@@ -173,4 +188,21 @@ class Hook_Record_Collector extends Stopwatch_Record_Collector {
 
 		return parent::get_records();
 	}
+
+	/**
+	 * @param string         $name  Event name.
+	 * @param StopwatchEvent $event Stopwatch event instance.
+	 *
+	 * @return Stopwatch_Record
+	 */
+	protected function transform( string $name, StopwatchEvent $event ): Stopwatch_Record {
+
+		$description = '';
+
+		if ( isset( $this->callbacks[ $name ] ) ) {
+			$description = implode( '<br />', $this->formatter->format( $this->callbacks[ $name ] ) );
+		}
+
+		return new Stopwatch_Record( $name, $event, $description );
+	}
 }