diff --git a/src/basic/,stubs_math/b9ea.log_FAC1.s b/src/basic/,stubs_math/b9ea.log_FAC1.s
index 8c6571d9..b2c293d4 100644
--- a/src/basic/,stubs_math/b9ea.log_FAC1.s
+++ b/src/basic/,stubs_math/b9ea.log_FAC1.s
@@ -18,3 +18,13 @@
 log_FAC1:
 
 	+STUB_IMPLEMENTATION
+
+
+poly_log:
+
+    !byte $03                          ; series length - 1
+
+    +PUT_CONST_POLY_LOG_1
+    +PUT_CONST_POLY_LOG_2
+    +PUT_CONST_POLY_LOG_3
+    +PUT_CONST_POLY_LOG_4
diff --git a/strings/0091146020 b/strings/0091146020
new file mode 100644
index 00000000..ce7137f7
--- /dev/null
+++ b/strings/0091146020
@@ -0,0 +1 @@
+Part of the polynomial for log approximation. This is a well known polynomial taken from the book "Computer Approximations" by John Fraser Hart et al. (ISBN 0-88275-642-7) according to https://www.c64-wiki.com/wiki/POLY1
diff --git a/strings/037F5E56CB7980139B0B6480763893168238AA3B20 b/strings/037F5E56CB7980139B0B6480763893168238AA3B20
new file mode 100644
index 00000000..ce7137f7
--- /dev/null
+++ b/strings/037F5E56CB7980139B0B6480763893168238AA3B20
@@ -0,0 +1 @@
+Part of the polynomial for log approximation. This is a well known polynomial taken from the book "Computer Approximations" by John Fraser Hart et al. (ISBN 0-88275-642-7) according to https://www.c64-wiki.com/wiki/POLY1
diff --git a/tools/generate_constants.cc b/tools/generate_constants.cc
index c9a4a7e4..e16e577a 100644
--- a/tools/generate_constants.cc
+++ b/tools/generate_constants.cc
@@ -78,6 +78,12 @@ std::vector<ConstEntry> GLOBAL_constants =
 	ConstEntry( "POLY_EXP_6", 0.24022638460   ),
 	ConstEntry( "POLY_EXP_7", 0.69314718618   ),
 	ConstEntry( "POLY_EXP_8", 1.0             ),
+
+    // Constants for log approximation, source as for exp above
+    ConstEntry( "POLY_LOG_1", 0.43425594189   ),
+    ConstEntry( "POLY_LOG_2", 0.57658454124   ),
+    ConstEntry( "POLY_LOG_3", 0.96180075919   ),
+    ConstEntry( "POLY_LOG_4", 2.8853900731    ),
 };
 
 //