1 files changed, 3 insertions, 1 deletions
diff --git a/README b/README
index d9ece2d..4047077 100644
--- a/README
+++ b/README
@@ -8,6 +8,8 @@ SYNOPSIS
 	#define LIBGEOME_DATUM_LONGITUDE  /* omitted */
 	#define LIBGEOME_DATUM_ALTITUDE   /* omitted */
 
+	#define LIBGEOME_LAST_DATUM /* whatever the datum represented with the highest bit is */
+
 	struct libgeome_data {
 		uint64_t requested_data;
 		double latitude;
@@ -37,7 +39,7 @@ SYNOPSIS
 	       const char *const *args;
 	};
 
-	extern struct libgeome_netservice libgeome_netservices[];
+	extern const struct libgeome_netservice libgeome_netservices[];
 	extern const size_t libgeome_netservices_count;
 
 	void libgeome_basic_context(struct libgeome_context *, const char *);