diff --git a/Code/thermal_printer/README.md b/Code/thermal_printer/README.md
index 807e83c..5a0464e 100644
--- a/Code/thermal_printer/README.md
+++ b/Code/thermal_printer/README.md
@@ -44,27 +44,19 @@ https://github.com/clockworkpi/DevTerm/blob/81addc7f4ba1eb4acb2f59fb1fef70386dbe
 #### DC2 # n   
 n:0-F, set printer printing density 
 
-```
-echo -en "\x12\x23\x0" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x1" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x2" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x3" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x4" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x5" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x6" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x7" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x8" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\x9" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\xa" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\xb" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\xc" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\xd" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\xe" > /tmp/DEVTERM_PRINTER_IN
-echo -en "\x12\x23\xf" > /tmp/DEVTERM_PRINTER_IN
-```
+If you want to set the printing depth (printer heating time), you can use the following command to set it:
 
-default density is 6
+For the lightest: 
 
+`echo -en "\x12\x23\x0" > /tmp/DEVTERM_PRINTER_IN`
+
+For the darkest: 
+
+`echo -en "\x12\x23\xf" > /tmp/DEVTERM_PRINTER_IN`
+
+There are a total of 16 levels from 0 to 0xf. The default density is 6.
+
+The heating time can be determined using the formula "n * (300 + n*46) microseconds."
 
 #### DC2 T  
 print the test page