diff --git a/src/epub/content.opf b/src/epub/content.opf
index 5352d21..b18f632 100644
--- a/src/epub/content.opf
+++ b/src/epub/content.opf
@@ -102,7 +102,7 @@
894604
72.97
- schema:workExample
+ schema:workExample
http://schema.org/SoftwareSourceCode
O. Henry