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diff --git a/Build/source/libs/libpng/libpng-src/contrib/pngsuite/README b/Build/source/libs/libpng/libpng-src/contrib/pngsuite/README
index 53ba5c8f7ed..d236b02e7c6 100644
--- a/Build/source/libs/libpng/libpng-src/contrib/pngsuite/README
+++ b/Build/source/libs/libpng/libpng-src/contrib/pngsuite/README
@@ -16,6 +16,8 @@ chunks, etc.
The "ft*.png" images are "free/libre" replacements for the transparent
corresponding t*.png images in the PngSuite.
+The "i*.png" images are the same images, but interlaced.
+
The images in this directory represent the basic PNG color-types:
grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
(1-8 bit) and grayscale or color images with alpha channel. You