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-rwxr-xr-xvest/line_mediator.pl2
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diff --git a/vest/line_mediator.pl b/vest/line_mediator.pl
index defc11e8..5ae13aa4 100755
--- a/vest/line_mediator.pl
+++ b/vest/line_mediator.pl
@@ -3,6 +3,8 @@
# if you don't know how to fork/exec in a C program, this could be helpful under limited cirmustances (would be ok to liaise with sentserver)
+#WARNING: because it waits for the result from command 2 after sending every line, and especially if command 1 does the same, using sentserver as command 2 won't actually buy you any real parallelism.
+
use strict;
use IPC::Open2;
$,=' ';