diff --git a/chapter04/src/restful_regions.js b/chapter04/src/restful_regions.js
index d1d8da7..7637d0c 100644
--- a/chapter04/src/restful_regions.js
+++ b/chapter04/src/restful_regions.js
@@ -7,40 +7,38 @@ const getRegion = async (
     res: any,
     dbConn: any,
     country: ?string,
-    id: ?string
+    region: ?string
 ) => {
-    console.log("COUNTRY", country, "ID", id, typeof id);
-
-    let sqlQuery = "";
-    if (country == null) {
-        sqlQuery = `
-            SELECT rr.*, cc.countryName 
-            FROM regions rr 
-            JOIN countries cc 
-            ON cc.countryCode=rr.countryCode
-            ORDER BY cc.countryCode, rr.regionCode
-      `;
-    } else if (id == null) {
-        sqlQuery = `
-            SELECT rr.*, cc.countryName 
-            FROM regions rr 
-            JOIN countries cc 
-            ON cc.countryCode=rr.countryCode
-            WHERE rr.countryCode="${country}"
-            ORDER BY rr.regionCode
-        `;
-    } else {
-        sqlQuery = `
-            SELECT rr.*, cc.countryName 
-            FROM regions rr 
-            JOIN countries cc 
-            ON cc.countryCode=rr.countryCode
-            WHERE rr.countryCode="${country}" 
-            AND rr.regionCode="${id}"
-        `;
-    }
-
     try {
+        let sqlQuery = "";
+        if (country == null) {
+            sqlQuery = `
+                SELECT rr.*, cc.countryName 
+                FROM regions rr 
+                JOIN countries cc 
+                ON cc.countryCode=rr.countryCode
+                ORDER BY cc.countryCode, rr.regionCode
+        `;
+        } else if (id == null) {
+            sqlQuery = `
+                SELECT rr.*, cc.countryName 
+                FROM regions rr 
+                JOIN countries cc 
+                ON cc.countryCode=rr.countryCode
+                WHERE rr.countryCode="${country}"
+                ORDER BY rr.regionCode
+            `;
+        } else {
+            sqlQuery = `
+                SELECT rr.*, cc.countryName 
+                FROM regions rr 
+                JOIN countries cc 
+                ON cc.countryCode=rr.countryCode
+                WHERE rr.countryCode="${country}" 
+                AND rr.regionCode="${region}"
+            `;
+        }
+
         const regions = await dbConn.query(sqlQuery);
         res
             .status(200)
@@ -57,22 +55,21 @@ const deleteRegion = async (
     country: string,
     region: string
 ) => {
-    const sqlCities = `
-        SELECT 1 FROM cities 
-        WHERE countryCode="${country} 
-        AND regionCode="${region} 
-        LIMIT 1"     
-    `;
-
     try {
+        const sqlCities = `
+            SELECT 1 FROM cities 
+            WHERE countryCode="${country}" 
+            AND regionCode="${region}" 
+            LIMIT 1"     
+        `;
         const cities = await dbConn.query(sqlCities);
         if (cities.length > 0) {
             res.status(403).send("Cannot delete a region with cities");
         } else {
             const deleteRegion = `
                 DELETE FROM regions 
-                WHERE countryCode="${country} 
-                AND regionCode="${region} 
+                WHERE countryCode="${country}" 
+                AND regionCode="${region}"
             `;
 
             const result = await dbConn.query(deleteRegion);
@@ -92,14 +89,58 @@ const putRegion = async (
     res: any,
     dbConn: any,
     country: string,
-    id: string,
-    region: any
+    region: string,
+    name: string
 ) => {
-    res.status(200).send("NOTHING DOING NOW...");
+    try {
+        const sqlCountry = `
+            SELECT 1 FROM countries
+            WHERE countryCode="${country}" 
+        `;
+        const countries = await dbConn.query(sqlCountry);
+        if (countries.length === 0) {
+            res.status(403).send("Country must exist");
+        }
+
+        const sqlGetRegion = `
+            SELECT 1 
+            FROM regions
+            WHERE countryCode="${country}" 
+            AND regionCode="${region}" 
+        `;
+        const regions = await dbConn.query(sqlGetRegion);
+        if (regions.length === 0) {
+            const sqlAddRegion = `
+                INSERT INTO regions SET 
+                countryCode="${country}",
+                regionCode="${region}",
+                regionName="${name}"
+            `;
+
+            const result = await dbConn.query(sqlAddRegion);
+            if (result.affectedRows > 0) {
+                res.status(201).send("Region created");
+            } else {
+                res.status(409).send("Region not created");
+            }
+        } else {
+            const sqlUpdateRegion = `
+                UPDATE regions
+                SET regionName="${name}"
+                WHERE countryCode="${country}" 
+                AND regionCode="${region}" 
+            `;
+
+            const result = await dbConn.query(sqlUpdateRegion);
+            if (result.affectedRows > 0) {
+                res.status(204).send("Region updated");
+            } else {
+                res.status(409).send("Region not updated");
+            }
+        }
+    } catch (e) {
+        res.status(500).send("Server error");
+    }
 };
 
-const postRegion = async (res: any, dbConn: any, region: any) => {
-    res.status(200).send("NOTHING DOING NOW...");
-};
-
-module.exports = { getRegion, putRegion, deleteRegion, postRegion };
+module.exports = { getRegion, deleteRegion, putRegion };
diff --git a/chapter04/src/restful_server.js b/chapter04/src/restful_server.js
index 30e137b..be37f72 100644
--- a/chapter04/src/restful_server.js
+++ b/chapter04/src/restful_server.js
@@ -13,8 +13,7 @@ const dbConn = require("./restful_db.js");
 const {
     getRegion,
     deleteRegion,
-    putRegion,
-    postRegion
+    putRegion
 } = require("./restful_regions.js");
 
 const SECRET_JWT_KEY = "modernJSbook";
@@ -77,11 +76,15 @@ app.delete("/regions/:country/:region", (req, res) =>
 );
 
 app.put("/regions/:country/:region", (req, res) =>
-    putRegion(res, dbConn, req.params.country, req.params.region)
+    putRegion(
+        res,
+        dbConn,
+        req.params.country,
+        req.params.region,
+        req.body.name
+    )
 );
 
-app.post("/regions", (req, res) => postRegion(res, dbConn));
-
 // END OF ROUTING FOR REGIONS
 
 // eslint-disable-next-line no-unused-vars