Document the BLKID_FILE environment variable in the libblkid man page

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/lib/blkid/libblkid.3.in b/lib/blkid/libblkid.3.in
index c3d316e43c57f6d0e21b8fb68eb79d2ad44c2532..31958d128697948cfc8ffd8e4d10101a6bf21303 100644 (file)
--- a/lib/blkid/libblkid.3.in
+++ b/lib/blkid/libblkid.3.in
@@ -29,6 +29,8 @@ and is verified to still be valid before being returned to the user
 (if the user has read permission on the raw block device, otherwise not).
 The cache file also allows unprivileged users (normally anyone other
 than root, or those not in the "disk" group) to locate devices by label/id.
+The standard location of the cache file can be overridden by the
+environment variable BLKID_FILE.
 .P
 In situations where one is getting information about a single known device,
 it does not impact performance whether the cache is used or not (unless you