HOWTO: Add some details for invalidate=

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 6d903bba0cb372745767ca7f81afcd19aefbc544..c2c65096bbd22461590c502aba6771b26598f672 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1426,7 +1426,9 @@ Buffers and memory
 .. option:: invalidate=bool
 
        Invalidate the buffer/page cache parts for this file prior to starting
-       I/O. Defaults to true.
+       I/O if the platform and file type support it. Defaults to true.
+       This will be ignored if :option:`pre_read` is also specified for the
+       same job.
 
 .. option:: sync=bool