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-rw-r--r--hesiod/README.hesiod8
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diff --git a/hesiod/README.hesiod b/hesiod/README.hesiod
index 18cd5d4..259ce8d 100644
--- a/hesiod/README.hesiod
+++ b/hesiod/README.hesiod
@@ -71,6 +71,14 @@ will want to create your own. It should look something like:
rhs=.your.domain
lhs=.ns
+ classes=in,hs
+
+The optional classes settings specifies which DNS classes Hesiod
+should do lookups in. Possible values are IN (the preferred class)
+and HS (the deprecated class, still used by some sites).
+You may specify both classes separated by a comma to try one class
+first and then the other if no entry is available in the first
+class. The default value of the classes variable is `IN,HS'.
The value of rhs can be overridden by the environment variable
`HES_DOMAIN'.