diff --git a/internal/domain/doc.go b/internal/domain/doc.go
new file mode 100644
index 0000000..f9ab05c
--- /dev/null
+++ b/internal/domain/doc.go
@@ -0,0 +1,3 @@
+// The domain package contains models, objects and entities used in all layers
+// of the project architecture.
+package domain