diff --git a/README.md b/README.md
index c77b87a..d995c06 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,7 @@ fn main() {
      * 4096-bit number.
      */
 }
+```
 
 ## Explanation
 `Prime`s are generated much the same way that large primes are generated by