diff --git a/README.md b/README.md
index 0e7a2fa..6e246a4 100644
--- a/README.md
+++ b/README.md
@@ -81,9 +81,9 @@ To make it easier to use the library with Java, configuration builders are avail
 ```java
 var config = new Config.Builder()
         .url("https://www.example.com/")
-        .shorturl("foobar")
+        .shortUrl("foobar")
         .callback("test")
-        .logstats(true)
+        .logStats(true)
         .format(Format.JSON)
         .build();
 
diff --git a/examples/src/main/java/com/example/IsgdSample.java b/examples/src/main/java/com/example/IsgdSample.java
index de24397..b79d095 100644
--- a/examples/src/main/java/com/example/IsgdSample.java
+++ b/examples/src/main/java/com/example/IsgdSample.java
@@ -12,7 +12,7 @@ public final class IsgdSample {
                 try {
                     if (arg.contains("is.gd")) {
                         System.out.println(arg + " <-- " + Isgd.lookup(arg));
-                        System.out.print(Isgd.lookup(new Config.Builder().shorturl(arg).format(Format.WEB).build()));
+                        System.out.print(Isgd.lookup(new Config.Builder().shortUrl(arg).format(Format.WEB).build()));
                     } else {
                         System.out.println(arg + " --> " + Isgd.shorten(arg));
                     }
diff --git a/src/main/kotlin/net/thauvin/erik/isgd/Config.kt b/src/main/kotlin/net/thauvin/erik/isgd/Config.kt
index f6bcb9d..3c132cf 100644
--- a/src/main/kotlin/net/thauvin/erik/isgd/Config.kt
+++ b/src/main/kotlin/net/thauvin/erik/isgd/Config.kt
@@ -44,19 +44,21 @@ class Config private constructor(
 ) {
     /**
      * Configures the parameters to create/lookup an is.gd shortlink.
+     *
+     * See the [is.gd API](https://is.gd/apishorteningreference.php).
      */
     data class Builder(
-        var url: String = "",
-        var shorturl: String = "",
-        var callback: String = "",
-        var logstats: Boolean = false,
-        var format: Format = Format.SIMPLE,
-        var isVgd: Boolean = false
+        private var url: String = "",
+        private var shorturl: String = "",
+        private var callback: String = "",
+        private var logstats: Boolean = false,
+        private var format: Format = Format.SIMPLE,
+        private var isVgd: Boolean = false
     ) {
         fun url(url: String) = apply { this.url = url }
-        fun shorturl(shorturl: String) = apply { this.shorturl = shorturl }
+        fun shortUrl(shortUrl: String) = apply { this.shorturl = shortUrl }
         fun callback(callback: String) = apply { this.callback = callback }
-        fun logstats(logstats: Boolean) = apply { this.logstats = logstats }
+        fun logStats(logStats: Boolean) = apply { this.logstats = logStats }
         fun format(format: Format) = apply { this.format = format }
         fun isVgd(isVgd: Boolean) = apply { this.isVgd = isVgd }
 
diff --git a/src/test/kotlin/net/thauvin/erik/isgd/IsgdTest.kt b/src/test/kotlin/net/thauvin/erik/isgd/IsgdTest.kt
index e01e4ee..9ec930a 100644
--- a/src/test/kotlin/net/thauvin/erik/isgd/IsgdTest.kt
+++ b/src/test/kotlin/net/thauvin/erik/isgd/IsgdTest.kt
@@ -84,7 +84,7 @@ class IsgdTest {
         assertFailsWith(
             message = "lookup(config:empty)",
             exceptionClass = IllegalArgumentException::class,
-            block = { Isgd.lookup(Config.Builder().shorturl("").build()) }
+            block = { Isgd.lookup(Config.Builder().shortUrl("").build()) }
         )
     }
 
@@ -96,10 +96,10 @@ class IsgdTest {
 
     @Test
     fun testLookupDefaultConfig() {
-        assertEquals(url, Isgd.lookup(Config.Builder().shorturl(shortUrl).build()), "lookup(config)")
+        assertEquals(url, Isgd.lookup(Config.Builder().shortUrl(shortUrl).build()), "lookup(config)")
         assertEquals(
             url, Isgd.lookup(
-                Config.Builder().shorturl(shortVgdUrl).isVgd(true).build()
+                Config.Builder().shortUrl(shortVgdUrl).isVgd(true).build()
             ), "lookup(config:isVgd)"
         )
     }
@@ -119,12 +119,12 @@ class IsgdTest {
     fun testLookupJsonConfig() {
         assertEquals(
             "{ \"url\": \"$url\" }",
-            Isgd.lookup(Config.Builder().shorturl(shortUrl).format(Format.JSON).build()), "lookup(config)"
+            Isgd.lookup(Config.Builder().shortUrl(shortUrl).format(Format.JSON).build()), "lookup(config)"
         )
 
         assertEquals(
             "test({ \"url\": \"$url\" });",
-            Isgd.lookup(Config.Builder().shorturl(shortUrl).callback("test").format(Format.JSON).build()),
+            Isgd.lookup(Config.Builder().shortUrl(shortUrl).callback("test").format(Format.JSON).build()),
             "lookup(config:callback)"
         )
     }
@@ -141,7 +141,7 @@ class IsgdTest {
     fun testLookupXmlConfig() {
         assertEquals(
             "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><output><url>$url</url></output>",
-            Isgd.lookup(Config.Builder().shorturl(shortUrl).format(Format.XML).build()),
+            Isgd.lookup(Config.Builder().shortUrl(shortUrl).format(Format.XML).build()),
             "lookup(config:xml)"
         )
     }
@@ -172,7 +172,7 @@ class IsgdTest {
         assertFailsWith(
             message = "shorten(config:shorturl)",
             exceptionClass = IsgdException::class,
-            block = { Isgd.shorten(Config.Builder(url).shorturl("test").build()) }
+            block = { Isgd.shorten(Config.Builder(url).shortUrl("test").build()) }
         )
     }
 
@@ -191,7 +191,7 @@ class IsgdTest {
             Isgd.shorten(Config.Builder().url(url).isVgd(true).build()),
             "shorten(config:isVgd)"
         )
-        assertThat(Isgd.shorten(Config.Builder().url(url).logstats(true).build()), "shorten(config:callback)")
+        assertThat(Isgd.shorten(Config.Builder().url(url).logStats(true).build()), "shorten(config:callback)")
             .matches("https://is.gd/\\w{6}".toRegex())
     }