diff --git a/runtime.c b/runtime.c
index b8d30ed6..5f577812 100644
--- a/runtime.c
+++ b/runtime.c
@@ -80,7 +80,7 @@ void Cyc_st_init() {
 }
 
 void Cyc_st_add(char *frame) { 
-  /* add to circ buf */ 
+  // TODO: do not add if (idx - 1) == frame, since that causes recursion to remove older frames
   Cyc_Stack_Traces[Cyc_Stack_Trace_Idx] = frame;
   Cyc_Stack_Trace_Idx = (Cyc_Stack_Trace_Idx + 1) % MAX_STACK_TRACES;
 }