1 files changed, 3 insertions, 0 deletions
diff --git a/node/Demarc.hpp b/node/Demarc.hpp
index 0bbdef44..78a05a34 100644
--- a/node/Demarc.hpp
+++ b/node/Demarc.hpp
@@ -60,6 +60,9 @@ class Demarc
 public:
 	/**
 	 * Local demarcation port
+	 *
+	 * NULL_PORT is zero so this can be used in if(port) to check for
+	 * a valid/known port.
 	 */
 	typedef uint64_t Port;