[DOC] missing index entry for http-check send-state
diff --git a/doc/configuration.txt b/doc/configuration.txt
index e29319c..8a91e7b 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -868,6 +868,7 @@
 grace                                     X          X         X         X
 hash-type                                 X          -         X         X
 http-check disable-on-404                 X          -         X         X
+http-check send-state                     X          -         X         X
 http-request                              -          X         X         X
 id                                        -          X         X         X
 ignore-persist                            -          X         X         X