diff --git a/README.md b/README.md
index 2f467f4..e3c8d1c 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ In addition to the extensions offered by upskirt, this package
 implements two additional Smartypants options:
 
 *   LaTeX-style dash parsing, where `--` is translated into
-    `–`
+    `–`, and `---` is translated into `—`
 *   Generic fractions, where anything that looks like a fraction
     is translated into suitable HTML (instead of just a few special
     cases). For example, `4/5` becomes `<sup>4</sup>&frasl;<sub>5</sub>`