diff --git a/zenity.doap b/zenity.doap
index 9592cee..b486778 100644
--- a/zenity.doap
+++ b/zenity.doap
@@ -10,6 +10,7 @@
   <download-page rdf:resource="http://download.gnome.org/sources/zenity/" />
   <bug-database rdf:resource="https://bugzilla.gnome.org/browse.cgi?product=zenity" />
   <category rdf:resource="http://api.gnome.org/doap-extensions#core" />
+  <programming-language>C</programming-language>
 
   <maintainer>
     <foaf:Person>