diff --git a/src/Simplex/Chat/Library/Internal.hs b/src/Simplex/Chat/Library/Internal.hs
index 55b52569bb..10238f3a3a 100644
--- a/src/Simplex/Chat/Library/Internal.hs
+++ b/src/Simplex/Chat/Library/Internal.hs
@@ -747,6 +747,7 @@ receiveViaCompleteFD user fileId RcvFileDescr {fileDescrText, fileDescrComplete}
     rd <- parseFileDescription fileDescrText
     let FD.ValidFileDescription FD.FileDescription {size = FD.FileSize encSize, redirect} = rd
         redirectSize = maybe 0 (\FD.RedirectFileInfo {size = FD.FileSize s} -> toInteger s) redirect
+        -- for a redirect, encSize is the description blob and redirectSize the final file; take the larger
         rcvSize = max (toInteger encSize) redirectSize
         -- 10 MB margin: encryption and chunk-size rounding make the transfer larger than the advertised size
         maxRcvSize = min expectedFileSize (toInteger FD.maxFileSizeHard) + toInteger (FD.mb 10 :: Int64)