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--- a/upqo/cdirectory_qo.h
+++ b/upqo/cdirectory_qo.h
@@ -30,7 +30,9 @@
 
 #include "libupnpp/control/cdirectory.hxx"
 
-// A thread object to run a single directory read operation
+// Asynchronous Content Directory reader.
+// A thread object to run a single directory read or search operation
+// We emit a signal whenever we read a new slice of results.
 class CDBrowseQO : public QThread {
     Q_OBJECT;