diff --git a/formats/format_g729.c b/formats/format_g729.c
index f4ba3db66843ff8ea174015fbf27135e7827d59c..cc9e7f6960fba88b1e30612bd23f815f34c48735 100755
--- a/formats/format_g729.c
+++ b/formats/format_g729.c
@@ -32,7 +32,7 @@
 #include <machine/endian.h>
 #endif
 
-/* Some Ideas for this code came from makeg729e.c by Jeffery Chilton */
+/* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */
 
 /* Portions of the conversion code are by guido@sienanet.it */
 
diff --git a/formats/format_gsm.c b/formats/format_gsm.c
index e154f64eb1ddf60f7c1ddb0d857f3574387c8f3b..88ca9fde7b5ce1bd297651d616f8a2b467b6ef75 100755
--- a/formats/format_gsm.c
+++ b/formats/format_gsm.c
@@ -34,7 +34,7 @@
 #include "msgsm.h"
 
 
-/* Some Ideas for this code came from makegsme.c by Jeffery Chilton */
+/* Some Ideas for this code came from makegsme.c by Jeffrey Chilton */
 
 /* Portions of the conversion code are by guido@sienanet.it */
 
diff --git a/formats/format_h263.c b/formats/format_h263.c
index 671a5f954cea7cf1b1e39d4f5eef08b452bd3daf..7a8866666c7966e715d4ebf28f8516fbafec3e99 100755
--- a/formats/format_h263.c
+++ b/formats/format_h263.c
@@ -32,7 +32,7 @@
 #include <machine/endian.h>
 #endif
 
-/* Some Ideas for this code came from makeh263e.c by Jeffery Chilton */
+/* Some Ideas for this code came from makeh263e.c by Jeffrey Chilton */
 
 /* Portions of the conversion code are by guido@sienanet.it */
 
diff --git a/formats/format_wav.c b/formats/format_wav.c
index 7cc5c6ff4fb240b2fc387514fa2c5594a5f29394..30b3f73d71c25bd943a650e55528e3d4276162b6 100755
--- a/formats/format_wav.c
+++ b/formats/format_wav.c
@@ -32,7 +32,7 @@
 #include <machine/endian.h>
 #endif
 
-/* Some Ideas for this code came from makewave.c by Jeffery Chilton */
+/* Some Ideas for this code came from makewave.c by Jeffrey Chilton */
 
 /* Portions of the conversion code are by guido@sienanet.it */
 
diff --git a/formats/format_wav_gsm.c b/formats/format_wav_gsm.c
index 7fdbb86045b3b97bcc95c5d824a3a56efc608e80..009c576bbb56a57e488803d805ddf6bb91027d2d 100755
--- a/formats/format_wav_gsm.c
+++ b/formats/format_wav_gsm.c
@@ -33,7 +33,7 @@
 #endif
 #include "msgsm.h"
 
-/* Some Ideas for this code came from makewave.c by Jeffery Chilton */
+/* Some Ideas for this code came from makewave.c by Jeffrey Chilton */
 
 /* Portions of the conversion code are by guido@sienanet.it */