regdb.h: add note that countries are sorted

diff --git a/daemon/regdb.h b/daemon/regdb.h
index cb6fa9f..fa25973 100644 (file)
--- a/daemon/regdb.h
+++ b/daemon/regdb.h
@@ -26,7 +26,12 @@ struct regdb_file_header {
        __be32  magic;
        /* must be REGDB_VERSION */
        __be32  version;
-       /* pointer (offset) into file where country list starts */
+       /*
+        * Pointer (offset) into file where country list starts
+        * and number of countries. The country list is sorted
+        * alphabetically to allow binary searching (should it
+        * become really huge.)
+        */
        __be32  reg_country_ptr;
        __be32  reg_country_num;
        /* length (in bytes) of the signature at the end of the file */