diff --git a/port/oc_storage.h b/port/oc_storage.h
index 758ce9747..fd5b7b8f3 100644
--- a/port/oc_storage.h
+++ b/port/oc_storage.h
@@ -29,6 +29,8 @@ extern "C" {
 
 /**
  * @brief open the storage
+ * NOTE: For embedded devices, this function doesn't do anything. However, it
+ * needs to be called for hosted/virtual devices.
  *
  * @param store the storage (path)
  * @return int