Better documentation of the method_name field.

Also passing empty string as opposed to NULL when the method name is not
found. This is much less error-prone.

1 files changed, 2 insertions, 1 deletions

diff --git a/include/grpc/grpc_security.h b/include/grpc/grpc_security.h
index f4e90a5ef5..655f45a29b 100644
--- a/include/grpc/grpc_security.h
+++ b/include/grpc/grpc_security.h
@@ -247,7 +247,8 @@ typedef struct {
   const char *service_url;
 
   /* The method name of the RPC being called (not fully qualified).
-     Can be NULL if no method name was found. */
+     The fully qualified method name can be built from the service_url:
+     full_qualified_method_name = ctx->service_url + '/' + ctx->method_name. */
   const char *method_name;
 
   /* The auth_context of the channel which gives the server's identity. */