diff --git a/xwords4/wasm/README.txt b/xwords4/wasm/README.txt
index d65711f3c..4dbe48400 100644
--- a/xwords4/wasm/README.txt
+++ b/xwords4/wasm/README.txt
@@ -1,7 +1,10 @@
 I installed emcc via
 # git clone https://github.com/emscripten-core/emsdk.git
 then
+# cd emsdk
 # git checkout 3.1.0
-
 But I have no particular reason to believe that tag's better than a
 later one when it comes along.
+# ./emsdk install latest
+# ./emsdk activate latest
+