diff --git a/gtk/gtkfilechooser.h b/gtk/gtkfilechooser.h
index bcc8734d8a..a7d0512b43 100644
--- a/gtk/gtkfilechooser.h
+++ b/gtk/gtkfilechooser.h
@@ -101,7 +101,7 @@ GType gtk_file_chooser_get_type (void) G_GNUC_CONST;
  * @GTK_FILE_CHOOSER_ERROR_BAD_FILENAME: Indicates a malformed filename.
  * @GTK_FILE_CHOOSER_ERROR_ALREADY_EXISTS: Indicates a duplicate path (e.g. when
  *  adding a bookmark).
- * @GTK_FILE_CHOOSER_ERROR_INCOMPLETE_HOSTNAME:
+ * @GTK_FILE_CHOOSER_ERROR_INCOMPLETE_HOSTNAME: Indicates an incomplete hostname (e.g. "http://foo" without a slash after that).
  *
  * These identify the various errors that can occur while calling
  * #GtkFileChooser functions.