diff --git a/README.md b/README.md
@@ -54,12 +54,13 @@ Each entry in the list should contain the following fields:
* **`caption` (optional):** A description of the picture
* **`author`:** The name of the author of the picture
* **`author-url` (optional):** A URL to a webpage by/on the picture's author
-* **`license`:** The license type of the picture. Should be one of
-`PD` (public domain), `CC0`, `CC-BY-1`, `CC-BY-2`, `CC-BY-3`, `CC-BY-4`,
-`CC-BY-NC-1`, `CC-BY-NC-2`, `CC-BY-NC-3`, `CC-BY-NC-4`, `CC-BY-NC-SA-1`,
-`CC-BY-NC-SA-2`, `CC-BY-NC-SA-3`, `CC-BY-NC-SA-4`, `CC-BY-ND-1`, `CC-BY-ND-2`,
-`CC-BY-ND-3`, `CC-BY-ND-4`, `CC-BY-NC-ND-1`, `CC-BY-NC-ND-2`, `CC-BY-NC-ND-3`
-or `CC-BY-NC-ND-4`
+* **`license`:** The license type of the picture. Should be one of `PD` (public
+ domain), `CC0`, `CC-BY-1`, `CC-BY-2`, `CC-BY-3`, `CC-BY-4`, `CC-BY-SA-1`,
+ `CC-BY-SA-2`, `CC-BY-SA-3`, `CC-BY-SA-4`, `CC-BY-NC-1`, `CC-BY-NC-2`,
+ `CC-BY-NC-3`, `CC-BY-NC-4`, `CC-BY-NC-SA-1`, `CC-BY-NC-SA-2`,
+ `CC-BY-NC-SA-3`, `CC-BY-NC-SA-4`, `CC-BY-ND-1`, `CC-BY-ND-2`, `CC-BY-ND-3`,
+ `CC-BY-ND-4`, `CC-BY-NC-ND-1`, `CC-BY-NC-ND-2`, `CC-BY-NC-ND-3` or
+ `CC-BY-NC-ND-4`
For best accessibility, the `alt` field should contain a concise visual
description of the picture in question (including subjects, colors and scenery)