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-rw-r--r--tools/recovery_l10n/README.md2
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diff --git a/tools/recovery_l10n/README.md b/tools/recovery_l10n/README.md
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+++ b/tools/recovery_l10n/README.md
@@ -25,6 +25,8 @@
* "pngcrush -c 0 ..." converts "text-out.png" into a 1-channel image,
which is accepted by Recovery. This also compresses the image file by
~60%.
+ * zopflipng could further compress the png files by ~10%, more details
+ in https://github.com/google/zopfli/blob/master/README.zopflipng
* If you're using other png compression tools, make sure the final text
image works by running graphic tests under the recovery mode.