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-rw-r--r--docs/manual/mod/mod_log_config.html.en7
1 files changed, 6 insertions, 1 deletions
diff --git a/docs/manual/mod/mod_log_config.html.en b/docs/manual/mod/mod_log_config.html.en
index a92913e0..c6b8c797 100644
--- a/docs/manual/mod/mod_log_config.html.en
+++ b/docs/manual/mod/mod_log_config.html.en
@@ -113,7 +113,12 @@
<tr><td><code>%{<var>VARNAME</var>}i</code></td>
<td>The contents of <code><var>VARNAME</var>:</code> header line(s)
in the request sent to the server. Changes made by other
- modules (e.g. <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>) affect this.
+ modules (e.g. <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>) affect this. If you're
+ interested in what the request header was prior to when most
+ modules would have modified it, use <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code>
+ to copy the header into an internal environment variable and log
+ that value with the <code>%{<var>VARNAME</var>}e</code> described
+ above.
</td></tr>
<tr class="odd"><td><code>%k</code></td>
<td>Number of keepalive requests handled on this connection. Interesting if