diff --git a/DrawGcode.py b/DrawGcode.py
index 3d6544a..d361f13 100644
--- a/DrawGcode.py
+++ b/DrawGcode.py
@@ -91,7 +91,7 @@ def file_reader(filename):
         elif "M280" in line:
             if "P0" in line and "S" in line:
                 s = readKey(line, "S")
-                if s >= 40:
+                if s >= 35:
                     pen = True
                 elif s == 0:
                     pen = False
diff --git a/README.md b/README.md
index b044df7..0afee93 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ A simple program that allows the graphical preview of .gcode files by utilising
 Mainly written for internal use in teaching the workings of G-code.
 
 Since it is written for use with a plotter only 2D G-codes are supported. The pen is controlled via M280 P0 S? commands
-S>40 is interpreted as pen down, S=0 is interpreted as pen up.
+S>35 is interpreted as pen down, S=0 is interpreted as pen up.
 
 Supported commands:
 G28