diff --git a/doc/src/usage.md b/doc/src/usage.md
index da74c01..a903796 100644
--- a/doc/src/usage.md
+++ b/doc/src/usage.md
@@ -274,6 +274,7 @@ ELISP> (let* ((res (pg-exec *pg* "SELECT encode('foobles', 'base64')"))
           (equal r (base64-encode-string "foobles")))
 t
 ```
+~~~