diff --git a/include/http.hrl b/include/http.hrl
index 4f2193f..3307e2d 100644
--- a/include/http.hrl
+++ b/include/http.hrl
@@ -4,7 +4,7 @@
          qargs    = undefined :: undefined | #{Key :: binary() := Value :: binary()},
          fragment = undefined :: undefined | none | binary(),
          version  = undefined :: undefined | http10 | http11 | http20,
-         headers  = undefined :: undefined | [{Key :: binary(), Value :: binary()}],
+         headers  = undefined :: undefined | #{Key :: binary() := Value :: binary()},
          cookies  = undefined :: undefined | #{Key :: binary() := Value :: binary()},
          enctype  = undefined :: undefined | none | urlencoded | json | multipart(),
          size     = undefined :: undefined | none | non_neg_integer(),