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-rw-r--r--docs/obg_format.txt2
-rw-r--r--docs/obs_format.txt2
2 files changed, 3 insertions, 1 deletions
diff --git a/docs/obg_format.txt b/docs/obg_format.txt
index 272ac5dcf..87fe11a71 100644
--- a/docs/obg_format.txt
+++ b/docs/obg_format.txt
@@ -49,6 +49,8 @@ tropical = TRGH.GRF
; GRF file with extra toyland sprites
toyland = TRGT.GRF
; NewGRF file using Actions 5, 7, 9 and A to replace sprites
+; Must use a GRF ID starting with FF so it cannot be selected from
+; the in-game NewGRF list and (thus) be loaded twice.
extra = OPENTTDD.GRF
; The md5s section lists the MD5 checksum for the files that replace them.
diff --git a/docs/obs_format.txt b/docs/obs_format.txt
index bb168ad30..7519f1bfe 100644
--- a/docs/obs_format.txt
+++ b/docs/obs_format.txt
@@ -36,7 +36,7 @@ description = foo
; The files section lists the files that replace sprites.
; The file names are case sensitive.
[files]
-; file with the samples
+; The file with the samples. Must contain exactly 73 samples.
samples = SAMPLES.CAT
; The md5s section lists the MD5 checksum for the files that replace them.