diff --git a/crates/ir/src/inst/control_flow.rs b/crates/ir/src/inst/control_flow.rs
index e4c9a2ad..f2cb4f4e 100644
--- a/crates/ir/src/inst/control_flow.rs
+++ b/crates/ir/src/inst/control_flow.rs
@@ -54,9 +54,11 @@ impl Phi {
     }
 }
 
+// We need to perform analysis or modify function signature definition to know
+// * if the function call has side effect
+// * if the function call is terminator
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Inst)]
 #[inst(side_effect(super::SideEffect::Write))]
-#[inst(terminator)]
 pub struct Call {
     callee: FuncRef,