diff --git a/src/basic/math_consts/b1a5.const_NEG_32768.s b/src/basic/math_consts/b1a5.const_NEG_32768.s
index ffa7c0b9..c080307a 100644
--- a/src/basic/math_consts/b1a5.const_NEG_32768.s
+++ b/src/basic/math_consts/b1a5.const_NEG_32768.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 - The floating point constant -32768
+;
+; This is verified to be identical to the original Microsoft implementation where it was named N32768.
 ;
-; Math package - a constant, for documentation see:
 ; - https://www.c64-wiki.com/wiki/BASIC-ROM
 ; - Computes Mapping the Commodore 64, page 105
 ;
diff --git a/tools/similarity.c b/tools/similarity.c
index e5c56e41..f2081fb4 100644
--- a/tools/similarity.c
+++ b/tools/similarity.c
@@ -20,10 +20,11 @@ int matches[MAX_SIZE];
 
 int phase_mask[MAX_SIZE+MAX_SIZE];
 
-#define NUM_CHUNKS 14
+#define NUM_CHUNKS 15
 // Pairs of start, end memory addresses of known exact similarity with the open source Microsoft BASIC
 unsigned short microsoft_basic_chunks[NUM_CHUNKS * 2] = {
     0xAEA8, 0xAEAC,
+    0xB1A5, 0xB1A9,
     0xB248, 0xB24C,
     0xB391, 0xB39D,
     0xB3A2, 0xB3A5,