diff --git a/README.md b/README.md
index 8ca916c9..c73ca0ad 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,8 @@ _note: select this item for any variant of board used in printers `'Prusa i3 MKx
 'clicking' the item will display the installation button; select choice `"1.0.1"` from the list(last known version as of the date of issue of this document)  
 _(after installation, the item is labeled as `"INSTALLED"` and can then be used for target board selection)_  
 
+   3. modify platform.txt to enable float printf support:
+   `"compiler.c.elf.flags=-w -Os -Wl,-u,vfprintf -lprintf_flt -lm -Wl,--gc-sections"`
 
 # 2. Source code compilation
 
@@ -88,4 +90,4 @@ Example:
 `ninja`
 
 ## Runing
-`./tests`
\ No newline at end of file
+`./tests`