diff --git a/README.md b/README.md
index 261d444..ccfe318 100644
--- a/README.md
+++ b/README.md
@@ -265,12 +265,24 @@ openFPGALoader [-b yourBoard] [-c yourCable] -m project_name/*.bit
 ```
 
 **By default, openFPGALoader load bitstream in memory, so the '-m' argument is optional**
+
 #### SPI Flash:
 
+##### bit
+
 ```bash
 openFPGALoader [-b yourBoard] [-c yourCable] -f project_name/*.bit
 ```
 
+##### mcs
+
+To generates *.mcs* file **PROM File** must be checked under **Exports Files** in *Lattice Diamond* left panel.
+
+```bash
+openFPGALoader [-b yourBoard] [-c yourCable] project_name/*.mcs
+```
+
+
 ### Trenz GOWIN LittleBee (TEC0117) and Sipeed Tang Nano
 
 *.fs* file is the default format generated by *Gowin IDE*, so nothing