diff --git a/src/basic/math_consts/bfbf.const_INV_LOG_2.s b/src/basic/math_consts/bfbf.const_INV_LOG_2.s
index 854c6ad3..dd6531e1 100644
--- a/src/basic/math_consts/bfbf.const_INV_LOG_2.s
+++ b/src/basic/math_consts/bfbf.const_INV_LOG_2.s
@@ -3,8 +3,14 @@
 ;; #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 - log2(e) = 1 / log(2)
 ;
-; Math package - a constant, for documentation see:
+; This is verified to be identical to the original Microsoft implementation where it was named LOGEB2
+;
+; See also:
 ; - https://www.c64-wiki.com/wiki/BASIC-ROM
 ;
 
diff --git a/tools/similarity.c b/tools/similarity.c
index af666106..1223d7ae 100644
--- a/tools/similarity.c
+++ b/tools/similarity.c
@@ -31,7 +31,7 @@ unsigned short microsoft_basic_chunks[NUM_CHUNKS * 2] = {
     0xBD7E, 0xBD90,
     0xBDB3, 0xBDC1,
     0xBDDD, 0xBF51,
-    0xBFB4, 0xBFBE,
+    0xBFB4, 0xBFC3,
 };