diff --git a/internal/nodes/http_request_cache.go b/internal/nodes/http_request_cache.go
index 4ab030d..6920d85 100644
--- a/internal/nodes/http_request_cache.go
+++ b/internal/nodes/http_request_cache.go
@@ -725,7 +725,7 @@ func (this *HTTPRequest) tryPartialReader(storage caches.StorageInterface, key s
 			r2, findOk := partialReader.Ranges().FindRangeAtPosition(r.Start())
 			if findOk && r2.Length() >= (256<<10) /* worth reading */ {
 				isOk = true
-				ranges[0] = [2]int64{r.Start(), partialReader.BodySize()} // Content-Range: bytes 0-[BODY_LENGTH]
+				ranges[0] = [2]int64{r.Start(), partialReader.BodySize()} // Content-Range: bytes 0-[CONTENT_LENGTH - 1]/CONTENT_LENGTH
 
 				pReader.SetNextReader(NewHTTPRequestPartialReader(this, r2.End(), partialReader))
 				return pReader, ranges, r2.End() - 1 /* not include last byte */, true