Update the IDN documentation for nslookup

diff --git a/bin/dig/nslookup.docbook b/bin/dig/nslookup.docbook
index 86a09c658e2d550ba97941cc126ae7559f7312fb..e41404a5a43fa69e6d0f48e04c693e2d0f935fd0 100644 (file)
--- a/bin/dig/nslookup.docbook
+++ b/bin/dig/nslookup.docbook
@@ -489,7 +489,8 @@ nslookup -query=hinfo  -timeout=10
       If you'd like to turn off the IDN support for some reason, define
       the <envar>IDN_DISABLE</envar> environment variable.
       The IDN support is disabled if the variable is set when
-      <command>nslookup</command> runs.
+      <command>nslookup</command> runs or when the standard output is not
+      a tty.
     </para>
   </refsection>