Index: llvm/lib/Target/WebAssembly/README.txt
===================================================================
--- llvm/lib/Target/WebAssembly/README.txt
+++ llvm/lib/Target/WebAssembly/README.txt
@@ -19,13 +19,16 @@
 wasi-sdk provides a more minimal C/C++ SDK based on clang, llvm and a libc based
 on musl, for producing WebAssemmbly applictions that use the WASI ABI.
 
-Rust provides WebAssembly support integrated into Cargo. There are two
+Rust provides WebAssembly support integrated into Cargo. There are three
 main options:
  - wasm32-unknown-unknown, which provides a relatively minimal environment
    that has an emphasis on being "native"
  - wasm32-unknown-emscripten, which uses Emscripten internally and
    provides standard C/C++ libraries, filesystem emulation, GL and SDL
    bindings
+- wasm32-wasi, which provides  WASI (WebAssembly System Interface) 
+ environment to define a standardized set of syscalls, filesystem access,
+ network access, etc
 For more information, see:
   * https://www.hellorust.com/