README.md: s/png/jpg/ in image processing instructions

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 59378cb..6aa9d08 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ Notes:
 2. Use [`pngquant`][pngquant] to shrink [PNGs][png].
 3. Use `gm convert -define web:lossless=true foo.{png,webp}`
    to compress PNGs and convert them to `webp`s.
-4. Use `gm convert foo.{png,webp}`
+4. Use `gm convert foo.{jpg,webp}`
    to compress JPEGs and convert them to to `webp`s.
 5. Use the `pe-figure` shortcode for progressive enhanced `figure` tags
    with a fallback image.