Index: src/wp-includes/l10n.php
===================================================================
--- src/wp-includes/l10n.php	(revision 28936)
+++ src/wp-includes/l10n.php	(working copy)
@@ -550,6 +550,7 @@
  * The .mo file should be named based on the text domain with a dash, and then the locale exactly.
  *
  * @since 1.5.0
+ * @since 2.8.1 Return was added.
  *
  * @param string $domain          Unique identifier for retrieving translated strings
  * @param string $deprecated      Use the $plugin_rel_path parameter instead.
@@ -622,6 +623,7 @@
  * The .mo files must be named based on the locale exactly.
  *
  * @since 1.5.0
+ * @since 2.8.1 Return was added.
  *
  * @param string $domain Text domain. Unique identifier for retrieving translated strings.
  * @param string $path   Optional. Path to the directory containing the .mo file.
@@ -679,6 +681,8 @@
  *
  * If there isn't one, returns empty Translations instance.
  *
+ * @since 2.8.0
+ *
  * @param string $domain Text domain. Unique identifier for retrieving translated strings.
  * @return Translations A Translations instance.
  */
@@ -694,6 +698,7 @@
  * Whether there are translations for the text domain.
  *
  * @since 3.0.0
+ *
  * @param string $domain Text domain. Unique identifier for retrieving translated strings.
  * @return bool Whether there are translations.
  */