diff --git a/os/emscripten/README.md b/os/emscripten/README.md
index 2af4ab3dbc..7cd818c7d6 100644
--- a/os/emscripten/README.md
+++ b/os/emscripten/README.md
@@ -1,8 +1,13 @@
 ## How to build with Emscripten
 
-Building with Emscripten works with emsdk 2.0.31 and above.
+Building with Emscripten works with emsdk 3.0.0 and above.
+
+You will also need autoconf, libharfbuzz-dev, and libicu-dev installed on your host OS.
+
 
 ```
+  sudo apt-get install autoconf automake libtool libharfbuzz-dev libicu-dev
+
   ./emscripten-build.sh
 ```