diff --git a/aom_util/debug_util.c b/aom_util/debug_util.c
index e57935e..3e9c314 100644
--- a/aom_util/debug_util.c
+++ b/aom_util/debug_util.c
@@ -10,6 +10,7 @@
  */
 
 #include <assert.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
 #include "aom_util/debug_util.h"
@@ -68,16 +69,19 @@
 }
 
 void bitstream_queue_push(int result, const aom_cdf_prob *cdf, int nsymbs) {
-  // If you observe a cdf error, turn the following debug code on and
-  // set target_frame_idx_r and target_queue_r accordingly.
-  /*
-  int target_frame_idx_r = 1;
-  int target_queue_r = 18005;
-  if (frame_idx_w == target_frame_idx_r && queue_w == target_queue_r) {
-    fprintf(stderr, "\n *** bitstream queue at frame_idx_w %d queue_w %d\n",
-    frame_idx_w, queue_w);
+  // If you observe a CDF error:
+  // - Set 'debug_cdf_mismatch' to true
+  // - Set target_frame_idx_r and target_queue_r to where CDF error was reported
+  // - Set a breakpoint in debugger at the 'fprintf' below.
+  const bool debug_cdf_mismatch = false;
+  if (debug_cdf_mismatch) {
+    int target_frame_idx_r = 1;
+    int target_queue_r = 18005;
+    if (frame_idx_w == target_frame_idx_r && queue_w == target_queue_r) {
+      fprintf(stderr, "\n *** bitstream queue at frame_idx_w %d queue_w %d\n",
+              frame_idx_w, queue_w);
+    }
   }
-  */
   if (!skip_w) {
     result_queue[queue_w] = result;
     nsymbs_queue[queue_w] = nsymbs;