diff --git a/src/app/robots.rs b/src/app/robots.rs
index ec513ff..e41cfe8 100644
--- a/src/app/robots.rs
+++ b/src/app/robots.rs
@@ -10,16 +10,14 @@ use crate::simple::HandlingError;
 #[derive(Serialize, Deserialize)]
 pub struct GetRobot {
     #[serde(skip_deserializing)]
-    pub id: i64,
+    pub id: Option<i64>,
     pub name: String,
 }
 
-type Model = GetRobot;
-
 impl std::convert::From<robots::Robot> for GetRobot {
     fn from(r: robots::Robot) -> GetRobot {
         GetRobot {
-            id: r.id,
+            id: Some(r.id),
             name: r.name,
         }
     }
@@ -72,14 +70,14 @@ pub async fn get_all(
     pool: PgSharedPool,
     offset: i64,
     limit: i64,
-) -> Result<(Vec<Model>, bool), HandlingError> {
+) -> Result<(Vec<GetRobot>, bool), HandlingError> {
     let mut tx = pool
         .begin()
         .await
         .map(|c| Box::new(c))
         .map_err(|e| HandlingError::DBError(e))?;
 
-    let mut repo = postgres::ModelImpl::new(&mut tx);
+    let mut repo = postgres::RobotsImpl::new(&mut tx);
     let (items, next) = repo.get_all()?.paginate(offset, limit).await?;
 
     let data = items.into_iter().map(|r| r.into()).collect();
@@ -114,7 +112,7 @@ pub async fn delete_robot(pool: PgSharedPool, id: i64) -> Result<(), HandlingErr
         .map(|c| Box::new(c))
         .map_err(|e| HandlingError::DBError(e))?;
 
-    let mut repo = postgres::ModelImpl::new(&mut tx);
+    let mut repo = postgres::RobotsImpl::new(&mut tx);
     let _: () = robots::delete(&mut repo, id).await?;
 
     tx.commit().await.map_err(|e| HandlingError::DBError(e))?;
diff --git a/src/data/postgres.rs b/src/data/postgres.rs
index 220fa26..e605681 100644
--- a/src/data/postgres.rs
+++ b/src/data/postgres.rs
@@ -14,6 +14,7 @@ pub struct Collection<'a> {
 }
 
 impl Collection<'_> {
+    #[allow(dead_code)]
     pub fn by_id(self, id: i64) -> Self {
         Self {
             tx: self.tx,
@@ -62,8 +63,6 @@ pub struct RobotsImpl<'a> {
     pub tx: &'a mut Box<sqlx::Transaction<'static, sqlx::Postgres>>,
 }
 
-pub type ModelImpl<'a> = RobotsImpl<'a>;
-
 impl<'a> RobotsImpl<'_> {
     pub fn new<'b>(tx: &'b mut Box<sqlx::Transaction<'static, sqlx::Postgres>>) -> RobotsImpl<'b> {
         RobotsImpl { tx: tx }
diff --git a/src/http/robots.rs b/src/http/robots.rs
index 1bf7ae0..883f63f 100644
--- a/src/http/robots.rs
+++ b/src/http/robots.rs
@@ -21,6 +21,7 @@ struct Pagination<T> {
     pub next: bool,
 }
 
+// add a new robot entry
 async fn create(
     pool: PgSharedPool,
     r: app::robots::GetRobot,
@@ -28,10 +29,12 @@ async fn create(
     reply_json(app::robots::add_robot(pool, r).await)
 }
 
+// retrieve information of a single robot
 async fn get(pool: PgSharedPool, id: i64) -> Result<impl warp::Reply, warp::Rejection> {
     reply_json(app::robots::get_robot(pool, id).await)
 }
 
+// updates robot information
 async fn update(
     pool: PgSharedPool,
     id: i64,
@@ -40,6 +43,7 @@ async fn update(
     reply_json(app::robots::update_robot(pool, id, r).await)
 }
 
+// returns a pagination of all robots
 async fn get_all(
     pool: PgSharedPool,
     p: PaginationOptions,
@@ -54,6 +58,7 @@ async fn get_all(
     )
 }
 
+// will delete the requested robot
 async fn delete(pool: PgSharedPool, id: i64) -> Result<impl warp::Reply, warp::Rejection> {
     match app::robots::delete_robot(pool, id).await {
         Ok(_) => Ok(warp::reply::with_status(
@@ -64,45 +69,81 @@ async fn delete(pool: PgSharedPool, id: i64) -> Result<impl warp::Reply, warp::R
     }
 }
 
+// builds the route structure for "/robots" endpoint
 pub fn all(
     base: warp::filters::BoxedFilter<(impl warp::Reply + 'static,)>,
     pool: PgSharedPool,
 ) -> warp::filters::BoxedFilter<(impl warp::Reply,)> {
+    // create a prefix that injects a database connection for every request
+    // every filter is added after the prefix so it receives a database connection
     let prefix = warp::path!("robots").map(move || pool.clone());
 
-    base.or(prefix
-        .clone()
-        .and(warp::filters::method::post())
-        .and(warp::body::json())
-        .and_then(create))
-        .or(prefix
+    base.or(
+        // filter for creating new robots
+        prefix
             .clone()
+            // match HTTP POST method
+            .and(warp::filters::method::post())
+            // attempts to parse the request's body as JSON
+            .and(warp::body::json())
+            // bind the handler
+            .and_then(create),
+    )
+    .or(
+        // filter for retrieving a pagination of robots
+        prefix
+            .clone()
+            // match HTTP GET method
             .and(warp::filters::method::get())
+            // add pagination query parameters
             .and(warp::filters::query::query())
-            .and_then(get_all))
-        .boxed()
+            // bind the handler
+            .and_then(get_all),
+    )
+    .boxed()
 }
 
+// build the route structure for the "/robot/{id}" endpoint
 pub fn with_id(
     base: warp::filters::BoxedFilter<(impl warp::Reply + 'static,)>,
     pool: PgSharedPool,
 ) -> warp::filters::BoxedFilter<(impl warp::Reply,)> {
+    // we create a prefix containing the id of a robot and a shared database connection
+    // every filter is added after the prefix
+    // so it receives a robot's id and a database connection
     let prefix = warp::path!("robot" / i64)
         .map(move |id| (pool.clone(), id))
         .untuple_one();
 
-    base.or(prefix
-        .clone()
-        .and(warp::filters::method::get())
-        .and_then(get))
-        .or(prefix
+    // append the routes to the base filter
+    base.or(
+        // filter to get information on a robot
+        prefix
             .clone()
+            // match HTTP GET method
+            .and(warp::filters::method::get())
+            // bind the handler
+            .and_then(get),
+    )
+    .or(
+        // filter for updating individual robots
+        prefix
+            .clone()
+            // metch HTTP POST method
             .and(warp::filters::method::put())
+            // attempts to parse the request's body as JSON
             .and(warp::body::json())
-            .and_then(update))
-        .or(prefix
+            // bind the handler
+            .and_then(update),
+    )
+    .or(
+        // filter that deletes a robot entry
+        prefix
             .clone()
+            // match HTTP DELETE method
             .and(warp::filters::method::delete())
-            .and_then(delete))
-        .boxed()
+            // bind the handler
+            .and_then(delete),
+    )
+    .boxed()
 }