DOC: add some information on capture.(req|res).hdr
Clarify the beginning of the index.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 95f8eec..014d9db 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -10604,11 +10604,13 @@
capture.req.hdr(<idx>) : string
This extracts the content of the header captured by the "capture request
header", idx is the position of the capture keyword in the configuration.
+ The first entry is an index of 0.
See also: "capture request header"
capture.res.hdr(<idx>) : string
This extracts the content of the header captured by the "capture response
header", idx is the position of the capture keyword in the configuration.
+ The first entry is an index of 0.
See also: "capture response header"
hdr([<name>[,<occ>]]) : string