diff --git a/doc/bugs/S3_memory_leaks.mdwn b/doc/bugs/S3_memory_leaks.mdwn
index d8b10b075c..f612de3960 100644
--- a/doc/bugs/S3_memory_leaks.mdwn
+++ b/doc/bugs/S3_memory_leaks.mdwn
@@ -5,4 +5,6 @@ Sending a file to S3 causes a slow memory increase toward the file size.
 Copying the file back from S3 causes a slow memory increase toward the
 file size.
 
-The author of hS3 is aware of the problem, and working on it.
+The author of hS3 is aware of the problem, and working on it. I think I
+have identified the root cause of the buffering; it's done by hS3 so it can
+resend the data if S3 sends it a 307 redirect. --[[Joey]]