diff --git a/src/sqlite.hpp b/src/sqlite.hpp
index 6d932d0..51da00c 100644
--- a/src/sqlite.hpp
+++ b/src/sqlite.hpp
@@ -44,6 +44,7 @@ public:
         string description;
         string fulltext;
 
+        //! Returns true if date & time are equal.
         friend bool operator ==(const Database::entry &a,
                                 const Database::entry &b);
         //! The full text in one line.