diff --git a/README.md b/README.md
index 5daecc7..631d086 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,36 @@ You can get daily rates from a starting end an end date, using:
                 ...
 
 
+### Fluctuations
+
+The parameters to retrieve the fluctuations are exactly the same then the time-series rates.
+
+    $return = $fixer->rates->getDailyFluctuation("2018-05-01", "2018-05-03", $baseCurrency, $symbols);
+
+You will then get the daily flactuations for each currencies from the start to end date:
+
+    Array
+    (
+        [base] => EUR
+        [rates] => Array
+            (
+                [USD] => stdClass Object
+                    (
+                        [start_rate] => 1.199468
+                        [end_rate] => 1.199326
+                        [change] => -0.0001
+                        [change_pct] => -0.0118
+                    )
+                [GBP] => stdClass Object
+                    (
+                        [start_rate] => 0.881297
+                        [end_rate] => 0.883748
+                        [change] => 0.0025
+                        [change_pct] => 0.2781
+                    )
+            )
+    )
+
 ### Convert
 
 You can request the conversion from a currency to another. If you provide a date, it will return an historical rate.
diff --git a/src/FixerAPI/Rates.php b/src/FixerAPI/Rates.php
index d54669f..f5b4ed6 100644
--- a/src/FixerAPI/Rates.php
+++ b/src/FixerAPI/Rates.php
@@ -37,7 +37,15 @@ public function get($baseCurrency = null, $symbols = [], $date = null)
         return array('timestamp' => $response->timestamp, 'base' => $response->base, 'rates' => (array)$response->rates);
     }
 
-    public function prepareData($baseCurrency = null, $symbols = [], $startDate = null, $endDate = null)
+    /**
+     * Prepare rates options
+     * @param  string|null $baseCurrency the three-letter currency code of the base currency.
+     * @param  array $symbols list of comma-separated currency codes to limit output currencies.
+     * @param  string|null $startDate the series start date
+     * @param  string|null $endDate the series end date
+     * @return array
+     */
+    private function prepareData($baseCurrency, $symbols, $startDate = null, $endDate = null)
     {
         $data = array();
 
@@ -60,11 +68,45 @@ public function prepareData($baseCurrency = null, $symbols = [], $startDate = nu
         return $data;
     }
 
+    /**
+     * Get Time-series daily rates
+     * @param  string $startDate the series start date
+     * @param  string $endDate the series end date
+     * @param  string|null $baseCurrency the three-letter currency code of the base currency.
+     * @param  array $symbols list of comma-separated currency codes to limit output currencies.
+     * @return array
+     */
     public function getDailyRates($startDate, $endDate, $baseCurrency = null, $symbols = [])
     {
-        $data = $this->prepareData($baseCurrency, $symbols, $startDate, $endDate);
-
         $endPoint = "timeseries";
+        return $this->getSeries($endPoint, $startDate, $endDate, $baseCurrency, $symbols);
+    }
+
+    /**
+     * Get daily fluctuation rates
+     * @param  string $startDate the series start date
+     * @param  string $endDate the series end date
+     * @param  string|null $baseCurrency the three-letter currency code of the base currency.
+     * @param  array $symbols list of comma-separated currency codes to limit output currencies.
+     * @return array
+     */
+    public function getDailyFluctuation($startDate, $endDate, $baseCurrency = null, $symbols = [])
+    {
+        $endPoint = "fluctuation";
+        return $this->getSeries($endPoint, $startDate, $endDate, $baseCurrency, $symbols);
+    }
+    
+    /**
+     * Prepare and get series request
+     * @param  string $startDate the series start date
+     * @param  string $endDate the series end date
+     * @param  string|null $baseCurrency the three-letter currency code of the base currency.
+     * @param  array $symbols list of comma-separated currency codes to limit output currencies.
+     * @return array
+     */
+    private function getSeries($endPoint, $startDate, $endDate, $baseCurrency, $symbols)
+    {
+        $data = $this->prepareData($baseCurrency, $symbols, $startDate, $endDate);
 
         $response = $this->fixer->getResponse($endPoint, $data);
 
@@ -74,5 +116,4 @@ public function getDailyRates($startDate, $endDate, $baseCurrency = null, $symbo
 
         return array('base' => $response->base, 'rates' => (array)$response->rates);
     }
-    
 }