Add release notes

bin/varnishd/cache/cache_vrt_var.c

@@ -806,7 +806,7 @@ VRT_r_obj_hits(VRT_CTX)
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
 	CHECK_OBJ_NOTNULL(ctx->req, REQ_MAGIC);
 	CHECK_OBJ_NOTNULL(ctx->req->objcore, OBJCORE_MAGIC);
-	return (ctx->req->is_hit ? ctx->req->objcore->hits : 0);
+	return (ctx->req->is_hit ? ctx->req->objcore->hits : 1);
 }
 
 VCL_BOOL

doc/sphinx/whats-new/changes-6.1.rst

@@ -10,4 +10,8 @@ Changes in Varnish 6.1
 
 **XXX**
 
+Varnish now won't rewrite the content-length header when responding to any HEAD
+request, making it possible to cache HEAD requests independently from the GET
+ones (peviously a HEAD request had to be a pass to avoid this rewriting).
+
 *eof*