diff --git a/src/basic/math_consts/baf9.const_TEN.s b/src/basic/math_consts/baf9.const_TEN.s
index 94762816..5bc34a84 100644
--- a/src/basic/math_consts/baf9.const_TEN.s
+++ b/src/basic/math_consts/baf9.const_TEN.s
@@ -3,8 +3,13 @@
 ;; #LAYOUT# *   BASIC_0 #TAKE
 ;; #LAYOUT# *   *       #IGNORE
 
-;
+; This file is under the MIT license, it contains code released by Microsoft Corporation.
+; See LICENSE for more information.
+
 ; Math package - a constant, for documentation see:
+
+; This is verified to be identical to the original Microsoft implementation where it was named TENZC
+;
 ; - https://www.c64-wiki.com/wiki/BASIC-ROM
 ; - Computes Mapping the Commodore 64, page 114
 ;
diff --git a/tools/similarity.c b/tools/similarity.c
index 2e6dd772..d0c89ff1 100644
--- a/tools/similarity.c
+++ b/tools/similarity.c
@@ -27,7 +27,7 @@ unsigned short microsoft_basic_chunks[NUM_CHUNKS * 2] = {
     0xB3A2, 0xB3A5,
     0xB849, 0xB97D,
     0xB983, 0xB9BB,
-    0xBA28, 0xBAF8,
+    0xBA28, 0xBAFD,
     0xBB8F, 0xBCF2,
 };