Note in the rust doc that these comments are bidirectional

diff --git a/doc/HACKING/GettingStartedRust.md b/doc/HACKING/GettingStartedRust.md
index 7d8a74bfed43fa7270d23d6e42e91ce1fb97dd97..181535122c0f987ffcbd11bf6d9b89dec4d06eda 100644 (file)
--- a/doc/HACKING/GettingStartedRust.md
+++ b/doc/HACKING/GettingStartedRust.md
@@ -131,7 +131,9 @@ as follows:
 
   /// C_RUST_COUPLED: <path_to_file> `<name_of_c_object>`
 
-Where <name_of_c_object> can be an enum, struct, constant, etc.
+Where <name_of_c_object> can be an enum, struct, constant, etc.  Then, do the
+same in the C code, to note that rust will need to be changed when the C
+does.
 
  Adding your Rust module to Tor's build system
 -----------------------------------------------