diff --git a/hydra-http-form.c b/hydra-http-form.c
index 2ff75a06..022cc244 100644
--- a/hydra-http-form.c
+++ b/hydra-http-form.c
@@ -1476,7 +1476,8 @@ void usage_http_form(const char *service) {
          " the sent/received data!\n"
          " Note that using invalid login condition checks can result in false positives!\n"
          "\nThe following parameters are optional and are put between the form parameters\n"
-         "  and the condition string; seperate them too with colons:\n"
+         "and the condition string; seperate them too with colons:\n"
+         " 1=                  401 error response is interpreted as user/pass wrong\n"
          " 2=                  302 page forward return codes identify a successful attempt\n"
          " (c|C)=/page/uri     to define a different page to gather initial "
          "cookies from\n"