diff --git a/docs/3.x.x/guides/models.md b/docs/3.x.x/guides/models.md
index c286de9bc6..0a0e57f177 100644
--- a/docs/3.x.x/guides/models.md
+++ b/docs/3.x.x/guides/models.md
@@ -148,6 +148,17 @@ module.exports = {
 }
 ```
 
+**Example**
+```js
+// Create a pet
+var xhr = new XMLHttpRequest();
+xhr.open("POST", "/pets", true);
+xhr.setRequestHeader('Content-Type', 'application/json');
+xhr.send(JSON.stringify({
+  owner: '5c151d9d5b1d55194d3209be' // The id of the user you want to link
+}));
+```
+
 ### One-to-one
 
 Refer to the [one-to-one concept](../concepts/concepts.md#one-to-one) for informations.
@@ -211,6 +222,17 @@ module.exports = {
 }
 ```
 
+**Example**
+```js
+// Create an address
+var xhr = new XMLHttpRequest();
+xhr.open("POST", "/addresses", true);
+xhr.setRequestHeader('Content-Type', 'application/json');
+xhr.send(JSON.stringify({
+  user: '5c151d9d5b1d55194d3209be' // The id of the user you want to link
+}));
+```
+
 ### One-to-many
 
 Refer to the [one-to-many concept](../concepts/concepts.md#one-to-many) for more informations.
@@ -274,6 +296,25 @@ module.exports = {
 }
 ```
 
+**Examples**
+```js
+// Create an article
+var xhr = new XMLHttpRequest();
+xhr.open("POST", "/articles", true);
+xhr.setRequestHeader('Content-Type', 'application/json');
+xhr.send(JSON.stringify({
+  author: '5c151d9d5b1d55194d3209be' // The id of the user you want to link
+}));
+
+// Update an article
+var xhr = new XMLHttpRequest();
+xhr.open("PUT", "/users/5c151d9d5b1d55194d3209be", true);
+xhr.setRequestHeader('Content-Type', 'application/json');
+xhr.send(JSON.stringify({
+  articles: ['5c151d51eb28fd19457189f6', '5c151d51eb28fd19457189f8'] // Set of ALL articles linked to the user (existing articles + new article or - removed article)
+}));
+```
+
 ### Many-to-many
 
 Refer to the [many-to-many concept](../concepts/concepts.md#many-to-many).
@@ -343,6 +384,17 @@ module.exports = {
 }
 ```
 
+**Example**
+```js
+// Update a product
+var xhr = new XMLHttpRequest();
+xhr.open("PUT", "/products/5c151d9d5b1d55194d3209be", true);
+xhr.setRequestHeader('Content-Type', 'application/json');
+xhr.send(JSON.stringify({
+  categories: ['5c151d51eb28fd19457189f6', '5c151d51eb28fd19457189f8'] // Set of ALL categories linked to the product (existing categories + new category or - removed category)
+}));
+```
+
 ### Polymorphic
 
 The polymorphic relationships are the solution when you don't know which kind of model will be associated to your entry. A common use case is an `Image` model that can be associated to many others kind of models (Article, Product, User, etc).