diff --git a/src/hnswbuild.c b/src/hnswbuild.c
index 5bc7c7e..426364a 100644
--- a/src/hnswbuild.c
+++ b/src/hnswbuild.c
@@ -367,7 +367,7 @@ HnswElementMemory(HnswElement e, int m)
 	elementSize += sizeof(List);
 	elementSize += sizeof(ItemPointerData) + SIZEOF_VOID_P;
 	elementSize += VARSIZE_ANY(DatumGetPointer(e->value));
-	/* Each allocation has chunk header */
+	/* Each allocation has a chunk header */
 	elementSize += (e->level + 7) * GENERATIONCHUNK_RAWSIZE;
 	return elementSize;
 }