diff --git a/src/basic/math_trans/poly_exp.s b/src/basic/math_trans/bfc4.poly_exp.s
similarity index 61%
rename from src/basic/math_trans/poly_exp.s
rename to src/basic/math_trans/bfc4.poly_exp.s
index d585ff3c..43ccd183 100644
--- a/src/basic/math_trans/poly_exp.s
+++ b/src/basic/math_trans/bfc4.poly_exp.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.
+
 ; Polynomial for the exponential function
 
+; This is verified to be identical to the original Microsoft implementation where it was named EXPCON.
+
 
 !ifdef CONFIG_TRANSCENDENTAL_FUNCTIONS {
 
@@ -20,7 +26,7 @@ poly_exp:
     +PUT_CONST_POLY_EXP_5
     +PUT_CONST_POLY_EXP_6
     +PUT_CONST_POLY_EXP_7
-    +PUT_CONST_POLY_EXP_8
 
+    ; The constant const_ONE now follows as part of this polynomial
 
 }
diff --git a/tools/similarity.c b/tools/similarity.c
index 1223d7ae..3da0384e 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, 0xBFC3,
+    0xBFB4, 0xBFE7,
 };