(report_file_error): Clarify the case of slash defeating downcasing.

diff --git a/src/fileio.c b/src/fileio.c
index 6b9b9afb47cbec1dc6714d1717369f43d26e94ae..bf592fa7c4d1bb70707be54bf21aa47613520802 100644 (file)
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -260,7 +260,8 @@ report_file_error (string, data)
        break;
       default:
        /* System error messages are capitalized.  Downcase the initial
-          unless it is followed by a slash.  */
+          unless it is followed by a slash.  (The slash case caters to
+          error messages that begin with "I/O" or, in German, "E/A".)  */
        if (STRING_MULTIBYTE (errstring)
            && ! EQ (Faref (errstring, make_number (1)), make_number ('/')))
          {