diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index a6ec25b26974119a2a9760fa9d86b6831d114d1c..b7f99d9d2ade65fd14f23a82b9c2eaa8744cb957 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -7,6 +7,7 @@ Features and enhancements
 - #1101592 - Replace --itemlimit with --limit, supporting time limits as well.
 
 Bug fixes
+- #1118480 - Document _name arguments to file fields.
 - #1108700 - Remove obsolete references to prepare().
 - #1107546 - Check file presence with is_file() instead of file_exists().
 - #1097136 - Replace list_number with list_integer and list_float in set of
diff --git a/plugins/destinations/fields.inc b/plugins/destinations/fields.inc
index 1983ee46aed9cac3338ad18da43e0fb697140358..b28d3539f7f91b0b164962b5c94b0a05bdcfdc6a 100644
--- a/plugins/destinations/fields.inc
+++ b/plugins/destinations/fields.inc
@@ -413,11 +413,15 @@ class MigrateFileFieldHandler extends MigrateFieldHandler {
    * @param language
    *   Language of the text (defaults to destination language)
    * @param source_alt_name
+   *   Name of source field containing alt value for the file.
    * @param source_title_name
+   *   Name of source field containing title value for the file.
    * @param source_description_name
+   *   Name of source field containing description value for the file.
    * @param source_display_name
+   *   Name of source field containing display value for the file.
    * @param separator
-   *
+   *   String separating values within the incoming value.
    */
  static function arguments($source_path = NULL, $file_function = 'file_copy', $file_replace = FILE_EXISTS_RENAME, $language = NULL, $source_alt_name = NULL, $source_title_name = NULL, $source_description_name = NULL, $source_display_name = NULL, $separator = NULL) {
     return get_defined_vars();