diff --git a/src/hnswscan.c b/src/hnswscan.c
index dba3ca9..742779a 100644
--- a/src/hnswscan.c
+++ b/src/hnswscan.c
@@ -185,6 +185,7 @@ hnswgettuple(IndexScanDesc scan, ScanDirection dir)
 		scan->xs_ctup.t_self = *tid;
 #endif
 
+		/* Unpin buffer */
 		if (BufferIsValid(so->buf))
 			ReleaseBuffer(so->buf);
 
diff --git a/src/ivfscan.c b/src/ivfscan.c
index 6703120..340b519 100644
--- a/src/ivfscan.c
+++ b/src/ivfscan.c
@@ -343,6 +343,7 @@ ivfflatgettuple(IndexScanDesc scan, ScanDirection dir)
 		scan->xs_ctup.t_self = *tid;
 #endif
 
+		/* Unpin buffer */
 		if (BufferIsValid(so->buf))
 			ReleaseBuffer(so->buf);