Update file_append documentation
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fio.1 b/fio.1
index fee5427..91f96e0 100644
--- a/fio.1
+++ b/fio.1
@@ -390,7 +390,7 @@
Perform IO after the end of the file. Normally fio will operate within the
size of a file. If this option is set, then fio will append to the file
instead. This has identical behavior to setting \fRoffset\fP to the size
-of a file.
+of a file. This option is ignored on non-regular files.
.TP
.BI blocksize \fR=\fPint[,int] "\fR,\fB bs" \fR=\fPint[,int]
Block size for I/O units. Default: 4k. Values for reads, writes, and trims