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-rw-r--r--guix/build/download.scm3
1 files changed, 3 insertions, 0 deletions
diff --git a/guix/build/download.scm b/guix/build/download.scm
index 6c94fa0574..a3105ad41d 100644
--- a/guix/build/download.scm
+++ b/guix/build/download.scm
@@ -64,6 +64,9 @@ representing it in a human-readable way."
"Return a procedure to show the progress of FILE's download, which is
SIZE byte long. The returned procedure is suitable for use as an
argument to `dump-port'. The progress report is written to LOG-PORT."
+ ;; XXX: Because of <http://bugs.gnu.org/19939> this procedure is often not
+ ;; called as frequently as we'd like too; this is especially bad with Nginx
+ ;; on hydra.gnu.org, which returns whole nars as a single chunk.
(let ((start-time #f))
(let-syntax ((with-elapsed-time
(syntax-rules ()