diff --git a/c34/c34.txt b/c34/c34.txt
index a8371b6..6c970b4 100644
--- a/c34/c34.txt
+++ b/c34/c34.txt
@@ -1,7 +1,7 @@
 
 Modulation AFSK 2400 baud
-3000 Hz : bit 0
-4800 Hz : bit 1
+3000 Hz : bit 1
+4800 Hz : bit 0
 
 
 bits : little endian -> byte