diff --git a/Upgrading-the-windows-LLVM-binaries.md b/Upgrading-the-windows-LLVM-binaries.md
index ffbf322..879392f 100644
--- a/Upgrading-the-windows-LLVM-binaries.md
+++ b/Upgrading-the-windows-LLVM-binaries.md
@@ -3,5 +3,5 @@
 1. find the directory that contains `bin`, `include`, `lib`, `libexec`, `share`
 1. make a new directory named `llvm-[version]` and move the directories into it
 1. `zip -r llvm-[version].zip llvm-[version]`
-1. `s3put -b servo-deps --prefix $(pwd) --key_prefix msvc-deps/ llvm-[version].zip`
+1. `s3put -b servo-deps --prefix $(pwd) --key_prefix msvc-deps/ llvm-[version].zip --grant public-read`
 1. update [this line](https://github.com/servo/servo/blob/b49e74b1f277587b4899fb8feea6bb50d3a41312/python/servo/packages.py#L7) to reflect the new version
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