diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 27d8872c1d..71439a8347 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -1,8 +1,9 @@
-name: Rust docs
+name: Rust docs and WASM app
 on:
   push:
     branches:
-      - master
+      - main
+      - wasm_ci # TODO tmp
 jobs:
   book:
     name: Build and Deploy
@@ -14,6 +15,9 @@ jobs:
       - name: Install Rust
         uses: hecrj/setup-rust-action@v1
 
+      - name: Install wasm-pack
+        uses: jetli/wasm-pack-action@v0.4.0
+
       - name: Update apt
         run: sudo apt-get update
       - name: Install dependencies
@@ -28,6 +32,13 @@ jobs:
             mkdir -p book/book
             mv target/doc book/book/rustdoc
 
+      - name: Built LTN app for web
+        run: |
+            cd web
+            sed -i 's/^APPS=.*/APPS=ltn/' Makefile
+            make release
+            cp -Rv build/dist ../book/book/web/
+
       - name: Publish HTML
         uses: peaceiris/actions-gh-pages@v3
         with: