--- a/doc/Calypso-TCH-downlink	Mon May 20 01:02:37 2024 +0000
+++ b/doc/Calypso-TCH-downlink	Mon May 20 01:24:22 2024 +0000
@@ -121,7 +121,7 @@
 Catching the output of the network-side speech encoder
 ======================================================
 
-The set of FR1 test sequences included with later versions of GSM 06.10 specs
+The set of FR1 test sequences included with later versions of GSM 06.10 spec
 and the set of EFR test sequences in GSM 06.54 include special synchronization
 sequences that can be fed to the G.711 PCMA or PCMU input of the TRAU in the
 downlink direction, and the set of 160 possible speech encoder outputs for each