diff --git a/src/export/ExportCL.cpp b/src/export/ExportCL.cpp
index 546aa4cb3..e5b0233ce 100644
--- a/src/export/ExportCL.cpp
+++ b/src/export/ExportCL.cpp
@@ -134,6 +134,11 @@ void ExportCLOptions::PopulateOrExchange(ShuttleGui & S)
       }
       S.EndHorizontalLay();
 
+/* i18n-hint: Some programmer-oriented terminology here:
+   "Data" refers to the sound to be exported, "piped" means sent,
+   and "standard in" means the default input stream that the external program,
+   named by %f, will read.  And yes, it's %f, not %s -- this isn't actually used
+   in the program as a format string.  Keep %f unchanged. */
       S.AddTitle(_("Data will be piped to standard in. \"%f\" uses the file name in the export window."));
    }
    S.EndVerticalLay();