diff --git a/dev-libs/protothreads/metadata.xml b/dev-libs/protothreads/metadata.xml
index 57e5834819..cabdf5db8a 100644
--- a/dev-libs/protothreads/metadata.xml
+++ b/dev-libs/protothreads/metadata.xml
@@ -5,6 +5,6 @@
 		<email>lssndrbarbieri@gmail.com</email>
 		<name>Alessandro Barbieri</name>
 	</maintainer>
-	<longdescription>Protothreads are extremely lightweight stackless threads designed for severely memory constrained systems, such as small embedded systems or wireless sensor network nodes. Protothreads provide linear code execution for event-driven systems implemented in C. Protothreads can be used with or without an underlying operating system to provide blocking event-handlers. Protothreads provide sequential flow of control without complex state machines or full multi-threading.
+	<longdescription lang="en">Protothreads are extremely lightweight stackless threads designed for severely memory constrained systems, such as small embedded systems or wireless sensor network nodes. Protothreads provide linear code execution for event-driven systems implemented in C. Protothreads can be used with or without an underlying operating system to provide blocking event-handlers. Protothreads provide sequential flow of control without complex state machines or full multi-threading.
 	</longdescription>
 </pkgmetadata>