update README

README.md

@@ -75,12 +75,22 @@ pettyCache.bulkFetch(['a', 'b', 'c', 'd'], function(keys, callback) {
 
 **Options**
 
-```javascript
+```
 {
     ttl: 30000 // How long it should take for the cache entry to expire in milliseconds. Defaults to a random value between 30000 and 60000 (for jitter).
 }
 ```
 
+```
+{
+    // TTL can optional be specified with a range to pick a random value between `min` and `max` (for jitter).
+    ttl: {
+        min: 5000,
+        max: 10000
+    }
+}
+```
+
 ### pettyCache.bulkGet(keys, callback)
 
 Attempts to retrieve the values of the keys specified in the `keys` array. Returns a key-value hash of all specified keys with either the corresponding values from cache or `undefined` if a key was not found.
@@ -109,12 +119,22 @@ pettyCache.set({ key1: 'one', key2: 2, key3: 'three' }, function(err) {
 
 **Options**
 
-```javascript
+```
 {
     ttl: 30000 // How long it should take for the cache entries to expire in milliseconds. Defaults to a random value between 30000 and 60000 (for jitter).
 }
 ```
 
+```
+{
+    // TTL can optional be specified with a range to pick a random value between `min` and `max` (for jitter).
+    ttl: {
+        min: 5000,
+        max: 10000
+    }
+}
+```
+
 ### pettyCache.fetch(key, cacheMissFunction, [options,] callback)
 
 Attempts to retrieve the value from cache at the specified key. If it doesn't exist, it executes the specified cacheMissFunction that takes two parameters: an error and a value. `cacheMissFunction` should retrieve the expected value for the key from another source and pass it to the given callback. Either way, the resulting error or value is passed to `callback`.
@@ -133,12 +153,22 @@ pettyCache.fetch('key', function(callback) {
 
 **Options**
 
-```javascript
+```
 {
     ttl: 30000 // How long it should take for the cache entry to expire in milliseconds. Defaults to a random value between 30000 and 60000 (for jitter).
 }
 ```
 
+```
+{
+    // TTL can optional be specified with a range to pick a random value between `min` and `max` (for jitter).
+    ttl: {
+        min: 5000,
+        max: 10000
+    }
+}
+```
+
 ### pettyCache.get(key, callback)
 
 Attempts to retrieve the value from cache at the specified key. Returns `null` if the key doesn't exist.
@@ -170,12 +200,22 @@ pettyCache.patch('key', { a: 1 }, function(callback) {
 
 **Options**
 
-```javascript
+```
 {
     ttl: 30000 // How long it should take for the cache entry to expire in milliseconds. Defaults to a random value between 30000 and 60000 (for jitter).
 }
 ```
 
+```
+{
+    // TTL can optional be specified with a range to pick a random value between `min` and `max` (for jitter).
+    ttl: {
+        min: 5000,
+        max: 10000
+    }
+}
+```
+
 ### pettyCache.set(key, value, [options,] callback)
 
 Unconditionally sets a value for a given key.
@@ -192,12 +232,22 @@ pettyCache.set('key', { a: 'b' }, function(err) {
 
 **Options**
 
-```javascript
+```
 {
     ttl: 30000 // How long it should take for the cache entry to expire in milliseconds. Defaults to a random value between 30000 and 60000 (for jitter).
 }
 ```
 
+```
+{
+    // TTL can optional be specified with a range to pick a random value between `min` and `max` (for jitter).
+    ttl: {
+        min: 5000,
+        max: 10000
+    }
+}
+```
+
 ## Mutex
 
 ### pettyCache.mutex.lock(key, [options, [callback]])