diff --git a/docs/images/README.md b/docs/images/README.md
index 9944cdc..27451c4 100644
--- a/docs/images/README.md
+++ b/docs/images/README.md
@@ -1,5 +1,11 @@
 # genqlient logo
 
-`genqlient-orig.svg` is the original logo.  To create `genqlient.svg`, I:
+`genqlient-orig.svg` is the original logo, in editable SVG.  To create `genqlient.svg`, I:
 - converted all text to paths
 - added media queries to make the paths white if the user is in dark mode (see issue #17)
+
+For the social preview image (in GitHub settings), I ran:
+```sh
+convert -resize 2560x1280 -density 600 -gravity center \
+  -extent 2560x1280 docs/images/genqlient.{svg,png}
+```
diff --git a/docs/images/genqlient.png b/docs/images/genqlient.png
new file mode 100644
index 0000000..a81947f
Binary files /dev/null and b/docs/images/genqlient.png differ