diff --git a/docs/obg_format.txt b/docs/obg_format.txt
index 9be2883c40..dce14c8c7f 100644
--- a/docs/obg_format.txt
+++ b/docs/obg_format.txt
@@ -35,8 +35,8 @@ version      = 0
 ; Note that OpenTTD first tries the full ISO code, then the first
 ; two characters and then uses the fallback (no '.<iso code>').
 ; The ISO code matching is case sensitive!
-; So en_US will be used for en_UK if no en_UK translation is added.
-; As a result the below example has 'howdie' for en_US and en_UK but
+; So en_US will be used for en_GB if no en_UK translation is added.
+; As a result the below example has 'howdie' for en_US and en_GB but
 ; 'foo' for all other languages.
 description  = foo
 description.en_US = howdie
diff --git a/docs/obs_format.txt b/docs/obs_format.txt
index f18676891d..a4ee23d487 100644
--- a/docs/obs_format.txt
+++ b/docs/obs_format.txt
@@ -35,8 +35,8 @@ version      = 0
 ; Note that OpenTTD first tries the full ISO code, then the first
 ; two characters and then uses the fallback (no '.<iso code>').
 ; The ISO code matching is case sensitive!
-; So en_US will be used for en_UK if no en_UK translation is added.
-; As a result the below example has 'howdie' for en_US and en_UK but
+; So en_US will be used for en_GB if no en_UK translation is added.
+; As a result the below example has 'howdie' for en_US and en_GB but
 ; 'foo' for all other languages.
 description  = foo
 description.en_US = howdie