diff --git a/sample/src/main/kotlin/me/gujun/android/span/sample/SampleActivity.kt b/sample/src/main/kotlin/me/gujun/android/span/sample/SampleActivity.kt
index 7434c75..3f9e22e 100644
--- a/sample/src/main/kotlin/me/gujun/android/span/sample/SampleActivity.kt
+++ b/sample/src/main/kotlin/me/gujun/android/span/sample/SampleActivity.kt
@@ -43,15 +43,15 @@ class SampleActivity : AppCompatActivity() {
       }
       +"\n"
       span("Align normal") {
-        textAlign = "normal"
+        alignment = "normal"
       }
       +"\n"
       span("Align center") {
-        textAlign = "center"
+        alignment = "center"
       }
       +"\n"
       span("Align opposite") {
-        textAlign = "opposite"
+        alignment = "opposite"
       }
       +"\n"
       span("Underline") {
@@ -85,23 +85,29 @@ class SampleActivity : AppCompatActivity() {
       +"\n"
       span {
         lineSpacing = dp(8)
-        +"LineSpacingSpan"
+        backgroundColor = Color.LTGRAY
+        verticalPadding = dp(5)
+        +"LineSpacingWithVerticalPadding"
         +"\n"
-        +"LineSpacingSpan"
+        +"LineSpacingWithVerticalPadding"
         +"\n"
-        +"LineSpacingSpan"
+        +"LineSpacingWithVerticalPadding"
       }
       +"\n"
       quote(Color.RED, "QuoteSpan")
       +"\n"
       span {
-        +"Plain text"
-        subscript("SubscriptSpan")
-        superscript("SuperscriptSpan")
+        +"Plain"
+        subscript("Subscript") {
+          textSize = dp(8)
+        }
+        superscript("Superscript") {
+          textSize = dp(8)
+        }
       }
       +"\n"
       span("BackgroundSpan") {
-        backgroundColor = Color.LTGRAY
+        backgroundColor = Color.CYAN
       }
       +"\n"
       span("ForegroundSpan") {
@@ -116,7 +122,7 @@ class SampleActivity : AppCompatActivity() {
       span {
         textColor = Color.BLUE
         textSize = dp(20)
-        +"Simple text"
+        +"Origin text"
         +"\n"
         span("Override foreground") {
           textColor = Color.RED
diff --git a/span/build.gradle b/span/build.gradle
index 7115fb7..69cf5fd 100644
--- a/span/build.gradle
+++ b/span/build.gradle
@@ -33,7 +33,7 @@ install {
     pom.project {
       name ARTIFACTID
       description 'Styling text with fun'
-      url 'https://github.com/2dxgujun/span'
+      url 'https://github.com/2dxgujun/Spannable-In-Kotlin'
 
       packaging 'aar'
       groupId GROUP
@@ -69,7 +69,7 @@ try {
       repo = 'maven'
       name = ARTIFACTID
       licenses = ['Apache-2.0']
-      vcsUrl = 'https://github.com/2dxgujun/span.git'
+      vcsUrl = 'https://github.com/2dxgujun/Spannable-In-Kotlin.git'
     }
   }
 
@@ -78,7 +78,19 @@ try {
     classifier = 'sources'
   }
 
+  task javadoc(type: Javadoc) {
+    source = android.sourceSets.main.java.srcDirs
+    classpath = files(project.android.getBootClasspath())
+    excludes = ['**/*.kt']
+  }
+
+  task javadocJar(type: Jar, dependsOn: javadoc) {
+    from javadoc.destinationDir
+    classifier = 'javadoc'
+  }
+
   artifacts {
+    archives javadocJar
     archives sourcesJar
   }
 } catch (Exception e) {
diff --git a/span/src/main/kotlin/me/gujun/android/span/span.kt b/span/src/main/kotlin/me/gujun/android/span/span.kt
index 5bd6009..853f6f3 100644
--- a/span/src/main/kotlin/me/gujun/android/span/span.kt
+++ b/span/src/main/kotlin/me/gujun/android/span/span.kt
@@ -24,6 +24,7 @@ import android.view.View
 import me.gujun.android.span.style.CustomTypefaceSpan
 import me.gujun.android.span.style.LineSpacingSpan
 import me.gujun.android.span.style.TextDecorationLineSpan
+import me.gujun.android.span.style.VerticalPaddingSpan
 
 class Span(val parent: Span? = null) : SpannableStringBuilder() {
 
@@ -47,12 +48,18 @@ class Span(val parent: Span? = null) : SpannableStringBuilder() {
 
   var textStyle: String = parent?.textStyle ?: ""
 
-  var textAlign: String = parent?.textAlign ?: ""
+  var alignment: String = parent?.alignment ?: ""
 
   var textDecorationLine: String = parent?.textDecorationLine ?: ""
 
   @Dimension(unit = Dimension.PX) var lineSpacing: Int = UNSPECIFIED
 
+  @Dimension(unit = Dimension.PX) var paddingTop: Int = UNSPECIFIED
+
+  @Dimension(unit = Dimension.PX) var paddingBottom: Int = UNSPECIFIED
+
+  @Dimension(unit = Dimension.PX) var verticalPadding: Int = UNSPECIFIED
+
   var onClick: (() -> Unit)? = null
 
   var styles: ArrayList<Any> = arrayListOf()
@@ -102,8 +109,8 @@ class Span(val parent: Span? = null) : SpannableStringBuilder() {
   }
 
   private fun buildParagraphStyle(builder: ArrayList<Any>) {
-    if (!TextUtils.isEmpty(textAlign)) {
-      builder.add(AlignmentSpan.Standard(when (textAlign) {
+    if (!TextUtils.isEmpty(alignment)) {
+      builder.add(AlignmentSpan.Standard(when (alignment) {
         "normal" -> Layout.Alignment.ALIGN_NORMAL
         "opposite" -> Layout.Alignment.ALIGN_OPPOSITE
         "center" -> Layout.Alignment.ALIGN_CENTER
@@ -114,6 +121,20 @@ class Span(val parent: Span? = null) : SpannableStringBuilder() {
     if (lineSpacing != UNSPECIFIED) {
       builder.add(LineSpacingSpan(lineSpacing))
     }
+
+    paddingTop = when {
+      paddingTop != UNSPECIFIED -> paddingTop
+      verticalPadding != UNSPECIFIED -> verticalPadding
+      else -> 0
+    }
+    paddingBottom = when {
+      paddingBottom != UNSPECIFIED -> paddingBottom
+      verticalPadding != UNSPECIFIED -> verticalPadding
+      else -> 0
+    }
+    if (paddingTop != 0 || paddingBottom != 0) {
+      builder.add(VerticalPaddingSpan(paddingTop, paddingBottom))
+    }
   }
 
   fun build(): Span {
diff --git a/span/src/main/kotlin/me/gujun/android/span/style/VerticalPaddingSpan.kt b/span/src/main/kotlin/me/gujun/android/span/style/VerticalPaddingSpan.kt
new file mode 100644
index 0000000..e23e142
--- /dev/null
+++ b/span/src/main/kotlin/me/gujun/android/span/style/VerticalPaddingSpan.kt
@@ -0,0 +1,31 @@
+package me.gujun.android.span.style
+
+import android.graphics.Paint.FontMetricsInt
+import android.text.Spanned
+import android.text.style.LineHeightSpan
+
+class VerticalPaddingSpan(private val paddingTop: Int,
+    private val paddingBottom: Int) : LineHeightSpan {
+
+  override fun chooseHeight(text: CharSequence, start: Int, end: Int, spanstartv: Int, v: Int,
+      fm: FontMetricsInt) {
+    text as Spanned
+    val spanStart = text.getSpanStart(this)
+    val spanEnd = text.getSpanEnd(this)
+
+//    Log.d("DEBUG", "text: $text")
+//    Log.d("DEBUG", "spanStart: $spanStart")
+//    Log.d("DEBUG", "spanEnd: $spanEnd")
+//    Log.d("DEBUG", "start: $start")
+//    Log.d("DEBUG", "end: $end")
+//    Log.d("DEBUG", "spanstartv: $spanstartv")
+//    Log.d("DEBUG", "v: $v")
+
+    if (spanStart == start) {
+      fm.ascent -= paddingTop
+    }
+    if (spanEnd == end - 1) {
+      fm.descent += paddingBottom
+    }
+  }
+}
\ No newline at end of file