diff --git a/cookbook/src/lib.rs b/cookbook/src/lib.rs
index 3aab4e2..4b35b6a 100644
--- a/cookbook/src/lib.rs
+++ b/cookbook/src/lib.rs
@@ -2,6 +2,13 @@ mod meal;
 
 pub use self::meal::Meal;
 
+pub fn fetch_meals() -> Vec<Meal> {
+    vec![
+        Meal::new("Raclette".to_string(), 800),
+        Meal::new("Soupe".to_string(), 400),
+    ]
+}
+
 #[cfg(test)]
 mod tests {
     #[test]
diff --git a/cookbook/src/meal.rs b/cookbook/src/meal.rs
index 506f9de..393bfd4 100644
--- a/cookbook/src/meal.rs
+++ b/cookbook/src/meal.rs
@@ -7,7 +7,7 @@ pub struct Meal {
 }
 
 impl Meal {
-    pub fn new(name: String, nutritional_value: i32) -> Meal {
+    pub(super) fn new(name: String, nutritional_value: i32) -> Meal {
         Meal { name, nutritional_value }
     }
 
diff --git a/planner/src/bin/weekly.rs b/planner/src/bin/weekly.rs
index 3bed713..3874ffc 100644
--- a/planner/src/bin/weekly.rs
+++ b/planner/src/bin/weekly.rs
@@ -1,7 +1,7 @@
 //! The weekly menu planner
 //!
 
-use cookbook::Meal;
+use cookbook::{Meal, fetch_meals};
 use planner::solver::{Variables, Domain, solve_all};
 
 
@@ -11,10 +11,7 @@ fn generate_weekly_menu() -> String {
         ("MardiMidi".to_string(), None), ("MardiSoir".to_string(), None),
         ("MercrediMidi".to_string(), None), ("MercrediSoir".to_string(), None),
     ].iter().cloned().collect();
-    let meals: Domain<Meal> = Domain::new(vec![
-        Meal::new("Raclette".to_string(), 800),
-        Meal::new("Soupe".to_string(), 400),
-    ]);
+    let meals: Domain<Meal> = Domain::new(fetch_meals());
     let validator = |vars: &Variables<Meal>| {
         let mut result = true;
         for day in ["Lundi", "Mardi", "Mercredi"].into_iter() {
diff --git a/planner/src/solver.rs b/planner/src/solver.rs
index 31422ee..54f7346 100644
--- a/planner/src/solver.rs
+++ b/planner/src/solver.rs
@@ -1,7 +1,11 @@
+//! # Solver
+//!
+//! Provides `Variables`, `Domain` structs and `solve_all` function.
 use std::fmt;
 use std::clone::Clone;
 use std::collections::HashMap;
 
+/// An assignments map of variables
 pub type Variables<'a, V> = HashMap<String, Option<&'a V>>;
 
 enum Assignment<'a, V> {
@@ -10,6 +14,7 @@ enum Assignment<'a, V> {
 }
 
 
+/// The domain of values that can be assigned to variables
 #[derive(Clone)]
 pub struct Domain<V> {
     values: Vec<V>