diff --git a/hbbytecode/src/gen_valider.rs b/hbbytecode/src/gen_valider.rs
index 42e053f..a1223c1 100644
--- a/hbbytecode/src/gen_valider.rs
+++ b/hbbytecode/src/gen_valider.rs
@@ -90,7 +90,9 @@ macro_rules! gen_valider {
                             $crate::gen_valider::inst_chk!(
                                 rest, $ityn, $($opcode),*
                             )
-                        )|* => rest,
+                        )|*| $crate::gen_valider::inst_chk!(
+                            rest, bbb, BRC
+                        ) => rest,
 
                         // The plebs
                         _ => {
diff --git a/hbbytecode/src/lib.rs b/hbbytecode/src/lib.rs
index 08cb345..4919eba 100644
--- a/hbbytecode/src/lib.rs
+++ b/hbbytecode/src/lib.rs
@@ -18,6 +18,9 @@ macro_rules! constmod {
 }
 
 /// Invoke macro with bytecode definition format
+/// 
+/// Keep in mind BRC instruction is special-cased and you have to implement
+/// it manually.
 #[macro_export]
 macro_rules! invoke_with_def {
     ($macro:path) => {