diff --git a/mindbox-firebase/src/main/java/cloud/mindbox/mindbox_firebase/MindboxFirebase.kt b/mindbox-firebase/src/main/java/cloud/mindbox/mindbox_firebase/MindboxFirebase.kt
index 51949acb1..13c2024bc 100644
--- a/mindbox-firebase/src/main/java/cloud/mindbox/mindbox_firebase/MindboxFirebase.kt
+++ b/mindbox-firebase/src/main/java/cloud/mindbox/mindbox_firebase/MindboxFirebase.kt
@@ -4,7 +4,10 @@ import cloud.mindbox.mobile_sdk.logger.MindboxLogger
 import cloud.mindbox.mobile_sdk.pushes.MindboxPushService
 import cloud.mindbox.mobile_sdk.pushes.PushServiceHandler
 import cloud.mindbox.mobile_sdk.utils.ExceptionHandler
-
+/**
+ * An object to use when choosing push provider in Mindbox.initPushServices or Mindbox.init.
+ * Represents FCM
+ * */
 object MindboxFirebase : MindboxPushService {
 
     override val tag: String = "FCM"
diff --git a/mindbox-huawei/src/main/java/cloud/mindbox/mindbox_huawei/MindboxHuawei.kt b/mindbox-huawei/src/main/java/cloud/mindbox/mindbox_huawei/MindboxHuawei.kt
index 7eafd81f7..87d42293c 100644
--- a/mindbox-huawei/src/main/java/cloud/mindbox/mindbox_huawei/MindboxHuawei.kt
+++ b/mindbox-huawei/src/main/java/cloud/mindbox/mindbox_huawei/MindboxHuawei.kt
@@ -4,7 +4,10 @@ import cloud.mindbox.mobile_sdk.logger.MindboxLogger
 import cloud.mindbox.mobile_sdk.pushes.MindboxPushService
 import cloud.mindbox.mobile_sdk.pushes.PushServiceHandler
 import cloud.mindbox.mobile_sdk.utils.ExceptionHandler
-
+/**
+ * An object to use when choosing push provider in Mindbox.initPushServices or Mindbox.init.
+ * Represents HCM
+ * */
 object MindboxHuawei : MindboxPushService {
 
     override val tag: String = "HCM"
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/InitializeMindboxException.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/InitializeMindboxException.kt
index 7a51eb9f8..f96912d9a 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/InitializeMindboxException.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/InitializeMindboxException.kt
@@ -1,3 +1,5 @@
 package cloud.mindbox.mobile_sdk
-
+/**
+ * An error thrown during initialization in case validation of initialization fails
+ * */
 class InitializeMindboxException(message: String) : Exception(message)
\ No newline at end of file
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/abtests/CustomerAbMixer.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/abtests/CustomerAbMixer.kt
index 07750411e..efd26a7e3 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/abtests/CustomerAbMixer.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/abtests/CustomerAbMixer.kt
@@ -1,5 +1,5 @@
 package cloud.mindbox.mobile_sdk.abtests
 
-interface CustomerAbMixer {
+internal interface CustomerAbMixer {
     fun stringModulusHash(identifier: String, salt: String): Int
 }
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/di/Modules.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/di/Modules.kt
deleted file mode 100644
index e69de29bb..000000000
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/logger/MindboxLoggerImpl.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/logger/MindboxLoggerImpl.kt
index a8c2bdf6c..10423341b 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/logger/MindboxLoggerImpl.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/logger/MindboxLoggerImpl.kt
@@ -8,7 +8,9 @@ import cloud.mindbox.mobile_sdk.monitoring.domain.interfaces.MonitoringRepositor
 import com.android.volley.VolleyLog
 import kotlinx.coroutines.*
 import org.threeten.bp.Instant
-
+/**
+ * An interface for internal sdk work only. Do not implement or use it.
+ * */
 interface MindboxLogger {
 
     fun i(parent: Any, message: String)
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxError.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxError.kt
index 5dfef84f2..c1afb12b0 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxError.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxError.kt
@@ -2,7 +2,10 @@ package cloud.mindbox.mobile_sdk.models
 
 import com.google.gson.Gson
 import com.google.gson.annotations.JsonAdapter
-
+/**
+ * A class for representing Mindbox error.
+ * Used in operations.
+ * */
 sealed class MindboxError(open val statusCode: Int?) {
 
     companion object {
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxErrorAdapter.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxErrorAdapter.kt
index 7bc066206..b17bfe0ab 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxErrorAdapter.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/MindboxErrorAdapter.kt
@@ -8,7 +8,7 @@ import com.google.gson.stream.JsonReader
 import com.google.gson.stream.JsonToken
 import com.google.gson.stream.JsonWriter
 
-class MindboxErrorAdapter : TypeAdapter<MindboxError?>() {
+internal class MindboxErrorAdapter : TypeAdapter<MindboxError?>() {
 
     private val gson by lazy { Gson() }
 
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/ValidationMessage.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/ValidationMessage.kt
index 20689bd19..e068feace 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/ValidationMessage.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/models/ValidationMessage.kt
@@ -1,7 +1,9 @@
 package cloud.mindbox.mobile_sdk.models
 
 import com.google.gson.annotations.SerializedName
-
+/**
+ * A class to hold validation message if validation error occurs
+ * */
 data class ValidationMessage(
     @SerializedName("message") val message: String? = null,
     @SerializedName("location") val location: String? = null,
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/MindboxPushService.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/MindboxPushService.kt
index d4894a142..5b2694eaf 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/MindboxPushService.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/MindboxPushService.kt
@@ -2,7 +2,9 @@ package cloud.mindbox.mobile_sdk.pushes
 
 import cloud.mindbox.mobile_sdk.logger.MindboxLogger
 import cloud.mindbox.mobile_sdk.utils.ExceptionHandler
-
+/**
+ * An interface for internal sdk work only. Do not implement it
+ * */
 interface MindboxPushService {
 
     val tag: String
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushAction.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushAction.kt
index cc8db1a08..31a7b6231 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushAction.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushAction.kt
@@ -1,7 +1,11 @@
 package cloud.mindbox.mobile_sdk.pushes
 
 import com.google.gson.annotations.SerializedName
-
+/**
+ * A class representing mindbox push action in [RemoteMessage]
+ *  * You can use it as a model to store data from mindbox
+ *  * with your custom push notification implementation.
+ * */
 data class PushAction(
     @SerializedName("uniqueKey") val uniqueKey: String?,
     @SerializedName("text") val text: String?,
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushServiceHandler.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushServiceHandler.kt
index 13d62ca25..39ce43d89 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushServiceHandler.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/PushServiceHandler.kt
@@ -4,7 +4,9 @@ import android.content.Context
 import cloud.mindbox.mobile_sdk.logger.MindboxLoggerImpl
 import cloud.mindbox.mobile_sdk.utils.LoggingExceptionHandler
 import java.util.UUID
-
+/**
+* A class for internal sdk work only. Do not extend or use it
+* */
 abstract class PushServiceHandler {
 
     companion object {
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/RemoteMessage.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/RemoteMessage.kt
index 696bda175..73381905c 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/RemoteMessage.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/pushes/RemoteMessage.kt
@@ -1,5 +1,9 @@
 package cloud.mindbox.mobile_sdk.pushes
-
+/**
+ * A class representing mindbox remote message
+ * You can use it as a model to store data from mindbox
+ * with your custom push notification implementation.
+ * */
 data class RemoteMessage(
     val uniqueKey: String,
     val title: String,
diff --git a/sdk/src/main/java/cloud/mindbox/mobile_sdk/utils/ExceptionHandler.kt b/sdk/src/main/java/cloud/mindbox/mobile_sdk/utils/ExceptionHandler.kt
index 6ecc240f4..071a582c4 100644
--- a/sdk/src/main/java/cloud/mindbox/mobile_sdk/utils/ExceptionHandler.kt
+++ b/sdk/src/main/java/cloud/mindbox/mobile_sdk/utils/ExceptionHandler.kt
@@ -1,5 +1,7 @@
 package cloud.mindbox.mobile_sdk.utils
-
+/**
+ * A class for internal sdk work only. Do not extend or use it
+ * */
 abstract class ExceptionHandler {
 
     fun <T> runCatching(block: () -> T) {