diff --git a/app/build.gradle b/app/build.gradle
index 6dc1adad..44182020 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -32,8 +32,8 @@ android {
         targetSdkVersion stTargetSdkVersion
         minSdkVersion stMinSdkVersion
 
-        versionCode 512
-        versionName "5.512"
+        versionCode 513
+        versionName "5.513"
         applicationId "jp.juggler.subwaytooter"
         vectorDrawables.useSupportLibrary = true
 
diff --git a/base/src/androidTest/java/jp/juggler/ByteRangeTest.kt b/base/src/androidTest/java/jp/juggler/ByteRangeTest.kt
index b40ffcaa..1ca9cf16 100644
--- a/base/src/androidTest/java/jp/juggler/ByteRangeTest.kt
+++ b/base/src/androidTest/java/jp/juggler/ByteRangeTest.kt
@@ -12,6 +12,9 @@ import org.junit.Test
 
 class ByteRangeTest {
 
+    /**
+     * ByteRangeや StringUtilsのBase64が、commons-codecの出力結果と一致するか調べる。
+     */
     @Test
     fun testByteRangeBase64() {
         for (len in 0..300) {