diff --git a/inc/Service/Media/MediaHandler.php b/inc/Service/Media/MediaHandler.php
index d2c84262..116c29a7 100644
--- a/inc/Service/Media/MediaHandler.php
+++ b/inc/Service/Media/MediaHandler.php
@@ -40,7 +40,7 @@ interface MediaHandler {
 	 * @param string $file_mime The mime type of the file. MUST be of a value for which {@link supportsMime} returns true.
 	 * @param int $file_kind One of the FILE_KIND_* constants.
 	 * @return mixed An opaque handle.
-	 * @throws \RuntimeException On error.
+	 * @throws MediaException On error.
 	 */
 	public function openHandle(string $file_path, string $file_mime, int $file_kind): mixed;
 
@@ -51,6 +51,17 @@ interface MediaHandler {
 	 */
 	public function closeHandle(mixed $handle);
 
+	/**
+	 * Installs the given file and generates a thumbnail for it.
+	 *
+	 * @param mixed $handle
+	 * @param string $media_preferred_out_file_basepath
+	 * @param string $preferred_out_file_basepath
+	 * @param int $thumb_max_width
+	 * @param int $thumb_max_height
+	 * @return MediaInstallResult
+	 * @throws MediaException On error.
+	 */
 	public function installMediaAndGenerateThumb(
 		mixed $handle,
 		string $media_preferred_out_file_basepath,
@@ -67,7 +78,7 @@ interface MediaHandler {
 	 * @param int $max_width
 	 * @param int $max_height
 	 * @return ThumbGenerationResult
-	 * @throws \RuntimeException On error.
+	 * @throws MediaException On error.
 	 */
 	public function generateThumb(
 		mixed $handle,