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diff --git a/README.md b/README.md
index b1316f9..8645c27 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,18 @@ extraHead = '<script src="xxxx.js"></script>'
 extraCSSFiles = ["css/foo.css", "css/bar.css"]
 ```
 
+### Twitter Cards
+
+Add the following setting:
+
+```
+[params]
+twitterCards = true
+```
+
+In a post's front matter, include a keyword `images` with a value of a list of
+URLs of images that will be used for Twitter Cards.
+
 ### Insert content on every post
 
 ```