[pdfmod] Add translation clarification comment

[Gabriel Burt <gburt src gnome org>]

commit 31b0956ab2b06a97b9badf43bfdca4c1a3e72177
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Wed Jul 29 09:36:32 2009 -0700

    Add translation clarification comment

 src/PdfMod/PdfMod/PdfMod.cs |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/PdfMod/PdfMod/PdfMod.cs b/src/PdfMod/PdfMod/PdfMod.cs
index 6f4cce1..d1ec35a 100644
--- a/src/PdfMod/PdfMod/PdfMod.cs
+++ b/src/PdfMod/PdfMod/PdfMod.cs
@@ -265,6 +265,7 @@ namespace PdfMod
                 if (current_size_string == original_size_string) {
                     size_label.Text = original_size_string;
                 } else {
+                    // Translators: this string is used to show current/original file size, eg "2 MB (originally 1 MB)"
                     size_label.Text = String.Format (Catalog.GetString ("{0} (originally {1})"), current_size_string, original_size_string);
                 }
             }