diff --git a/.dockerignore b/.dockerignore
index 8ef0081..075760b 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,5 +1,5 @@
 .github
-spec
+spec/node_modules
 http
 target
 README.md
diff --git a/Dockerfile b/Dockerfile
index 531d6de..6a50398 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,10 +19,21 @@ COPY ./src ./src
 RUN rm ./target/release/deps/simplify_truths*
 RUN cargo build --release
 
+FROM node:20.14.0 as spec
+
+WORKDIR /spec
+
+COPY ./spec .
+RUN npm install
+RUN USER=root npm install -g @typespec/compiler && npm install -g @redocly/cli
+RUN npm run tsp-compile && npm run redoc-build
+
 FROM debian
 
 # copy the build artifact from the build stage
 COPY --from=build /simplify_truths/target/release/simplify_truths .
+# copy the generated html file for REDOC documentation
+COPY --from=spec /spec/dist/index.html ./openapi/index.html
 
 EXPOSE 8000
 
diff --git a/src/routing/index.rs b/src/routing/index.rs
index ec1f560..259f143 100644
--- a/src/routing/index.rs
+++ b/src/routing/index.rs
@@ -1,5 +1,5 @@
 use axum::body::Body;
-use axum::http::{header, StatusCode};
+use axum::http::StatusCode;
 use axum::response::{Html, IntoResponse, Response};
 use axum::Router;
 use axum::routing::get;
@@ -16,16 +16,17 @@ async fn index() -> &'static str {
     "Welcome to the Simplify Truths API!\n"
 }
 
-// TODO open from target dir in release mode.
 async fn open_api() -> Response {
-    let file_path = "./spec/dist/index.html";
+    let file_path = if cfg!(debug_assertions) {
+        "./spec/dist/index.html"
+    } else {
+        "./openapi/index.html"
+    };
     let file = match File::open(file_path).await {
         Ok(file) => file,
         Err(err) => return (StatusCode::NOT_FOUND, format!("File not found: {err}")).into_response(),
     };
-    // convert the `AsyncRead` into a `Stream`
     let stream = ReaderStream::new(file);
-    // convert the `Stream` into an `axum::body::HttpBody`
     let body = Body::from_stream(stream);
 
     Html(body).into_response()