diff --git a/features/minimal-printf/README.md b/features/minimal-printf/README.md
index 7f59dffb83..2ea089b716 100644
--- a/features/minimal-printf/README.md
+++ b/features/minimal-printf/README.md
@@ -1 +1,11 @@
-# mbed-printf
\ No newline at end of file
+# Minimal printf
+
+Prints directly to stdio/UART without using malloc. 
+Doesn't support any modifiers. 
+
+Supports: 
+* %d: signed long int
+* %u: unsigned long int
+* %p: void* (e.g. 0x00123456)
+* %s: string
+* %X: unsigned char printed as hexadecimal number (e.g., FF)