diff --git a/c_util b/c_util
index d8c571d1..e48c83f9 100755
--- a/c_util
+++ b/c_util
@@ -647,6 +647,9 @@ def main():
                 print()
             first_file = False
             
+            # Print filename header
+            print(f"{f}:")
+            
             # Print in new format
             for start, end, text in declarations:
                 print(f"[{start + 1}-{end + 1}] {text}")