diff --git a/CHANGELOG.md b/CHANGELOG.md
index e6b6994..ef798c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 Only place important and recommended versions here.
 
+## 2.3.1
+
+- Fixed issue #3 Didn't work on icons that placed on library modules.
+
 ## 2.3.0
 
 - Supported adaptive-icon
diff --git a/README.md b/README.md
index 5a972c8..a2607d2 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.0'
-        classpath 'me.2bab:scratch-paper:2.3.0'
+        classpath 'me.2bab:scratch-paper:2.3.1'
     }
 }
 ```
@@ -46,15 +46,7 @@ buildscript {
 apply plugin: 'me.2bab.scratchpaper'
 ```
 
-
-**0x03. Build your App and Enjoy!**
-
-![](./images/ic_launcher.png)![](./images/ic_launcher_round.png)
-
-![](./images/scratch-paper-json.jpg)
-
-
-**0x04. Advanced Configurations**
+**0x03. Advanced Configurations**
 
 ``` gradle
 scratchPaper {
@@ -72,6 +64,12 @@ scratchPaper {
 }
 ```
 
+**0x04. Build your App and Enjoy!**
+
+![](./images/ic_launcher.png)![](./images/ic_launcher_round.png)
+
+![](./images/scratch-paper-json.jpg)
+
 ## Compatible
 
 ScratchPaper only tests in Latest TWO Minor versions of Android Gradle Plugin.
diff --git a/README_zh.md b/README_zh.md
index 1f41177..c59b036 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -34,7 +34,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.0'
-        classpath 'me.2bab:scratch-paper:2.3.0'
+        classpath 'me.2bab:scratch-paper:2.3.1'
     }
 }
 ```
@@ -47,14 +47,7 @@ apply plugin: 'me.2bab.scratchpaper'
 ```
 
 
-**0x03. Build your App and Enjoy!**
-
-![](./images/ic_launcher.png)![](./images/ic_launcher_round.png)
-
- ![](./images/scratch-paper-json.jpg)
-
-
-**0x04. Advanced Configurations**
+**0x03. Advanced Configurations**
 
 ``` gradle
 scratchPaper {
@@ -65,13 +58,19 @@ scratchPaper {
     extraInfo = new Date().format("MM-dd,HH:mm")
     enableGenerateIconOverlay = true
     enableGenerateBuildInfo = true
-    
+
     // Experimental field
     // @see IconOverlayGenerator#removeXmlIconFiles
     enableXmlIconRemove = false
 }
 ```
 
+**0x04. Build your App and Enjoy!**
+
+![](./images/ic_launcher.png)![](./images/ic_launcher_round.png)
+
+![](./images/scratch-paper-json.jpg)
+
 ## 兼容性
 
 ScratchPaper 只会支持最新两个 Minor 版本的 Android Gradle Plugin：
diff --git a/build.gradle b/build.gradle
index db1fe06..30b8085 100644
--- a/build.gradle
+++ b/build.gradle
@@ -57,6 +57,6 @@ if (project.extensions.findByName("buildScan") != null) {
 
 // publish
 group 'me.2bab'
-version '2.3.0'
+version '2.3.1'
 apply from: 'bintray.gradle'
 apply from: 'mavenlocal.gradle'
\ No newline at end of file
diff --git a/src/main/kotlin/me/xx2bab/scratchpaper/IconOverlayGenerator.kt b/src/main/kotlin/me/xx2bab/scratchpaper/IconOverlayGenerator.kt
index 6b47eb3..a0d46a4 100644
--- a/src/main/kotlin/me/xx2bab/scratchpaper/IconOverlayGenerator.kt
+++ b/src/main/kotlin/me/xx2bab/scratchpaper/IconOverlayGenerator.kt
@@ -21,15 +21,18 @@ class IconOverlayGenerator(private val params: GeneratorParams) {
     fun process() {
         setAwtEnv()
         params.variant.outputs.forEach { output ->
-            val processManifestTask: MergeManifests = output.processManifest as MergeManifests
-
+            val processManifestTask = output.processManifest as MergeManifests
+            val mergeResourcesTask = params.variant.mergeResources as MergeResources
+            if (params.config.alwaysUpdateIconInfo) {
+                output.processResources.outputs.upToDateWhen { false }
+            }
             output.processResources.doFirst("process${params.dimension}IconsByScratchPaper") {
                 val processedIcons = arrayListOf<File>()
                 val mergedManifestFile = File(processManifestTask.manifestOutputDirectory,
                         "AndroidManifest.xml")
-                val resDirs = params.variant.sourceSets[0].resDirectories
                 val version = "@" + params.variant.mergedFlavor.versionName
                 val iconNames = getIconName(mergedManifestFile)
+                val resDirs = mergeResourcesTask.computeResourceSetList0()
                 findIcons(resDirs, iconNames).forEach { icon ->
                     val icons = addTextToIcon(params.project, params.dimension,
                             icon, params.config, params.dimension, version, params.config.extraInfo)
@@ -98,10 +101,10 @@ class IconOverlayGenerator(private val params: GeneratorParams) {
     /**
      * Finds all icon files matching the icon specified in the given manifest.
      */
-    private fun findIcons(where: Collection<File>, iconNames: Array<String>): Collection<File> {
+    private fun findIcons(where: List<File>?, iconNames: Array<String>): Collection<File> {
         val result: MutableSet<File> = hashSetOf()
-        where.forEach {
-            it.walk()
+        where?.forEach {
+            it.walk().maxDepth(3)
                     .filter { dir ->
                         dir.name.contains("mipmap") || dir.name.contains("drawable")
                     }
@@ -162,5 +165,37 @@ class IconOverlayGenerator(private val params: GeneratorParams) {
         return file.isFile && file.nameWithoutExtension == namePrefix
     }
 
+    /**
+     * To get all original resources including libraries
+     *
+     * @link github.com/Mobcase/McImage/blob/master/src/main/java/com/smallsoho/mcplugin/image/utils/HookUtil.kt
+     * @author smallSohoSolo
+     */
+    private fun MergeResources.computeResourceSetList0(): List<File>? {
+        val computeResourceSetListMethod = MergeResources::class.java.declaredMethods
+                .firstOrNull { it.name == "computeResourceSetList" && it.parameterCount == 0 }
+                ?: return null
+
+        val oldIsAccessible = computeResourceSetListMethod.isAccessible
+        try {
+            computeResourceSetListMethod.isAccessible = true
+
+            val resourceSets = computeResourceSetListMethod.invoke(this) as? Iterable<*>
+
+            return resourceSets
+                    ?.mapNotNull { resourceSet ->
+                        val getSourceFiles = resourceSet?.javaClass?.methods?.find {
+                            it.name == "getSourceFiles" && it.parameterCount == 0
+                        }
+                        val files = getSourceFiles?.invoke(resourceSet)
+                        @Suppress("UNCHECKED_CAST")
+                        files as? Iterable<File>
+                    }
+                    ?.flatten()
+
+        } finally {
+            computeResourceSetListMethod.isAccessible = oldIsAccessible
+        }
+    }
 
 }
\ No newline at end of file
diff --git a/src/main/kotlin/me/xx2bab/scratchpaper/ScratchPaperExtension.kt b/src/main/kotlin/me/xx2bab/scratchpaper/ScratchPaperExtension.kt
index 15201fc..bd4d498 100644
--- a/src/main/kotlin/me/xx2bab/scratchpaper/ScratchPaperExtension.kt
+++ b/src/main/kotlin/me/xx2bab/scratchpaper/ScratchPaperExtension.kt
@@ -22,6 +22,8 @@ open class ScratchPaperExtension {
 
     var extraInfo = ""
 
+    var alwaysUpdateIconInfo = true
+
     // Experimental field
     // @see IconOverlayGenerator#removeXmlIconFiles
     var enableXmlIconRemove = false