diff --git a/src/hnswvacuum.c b/src/hnswvacuum.c
index 06a73e0..b869326 100644
--- a/src/hnswvacuum.c
+++ b/src/hnswvacuum.c
@@ -9,7 +9,7 @@
 #include "utils/memutils.h"
 
 /*
- * Check if deleted list contains an index tid
+ * Check if deleted list contains an index TID
  */
 static bool
 DeletedContains(HTAB *deleted, ItemPointer indextid)