diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/SendVerificationMessageWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/SendVerificationMessageWorker.kt
index 2b049e0061..0d5387bbe0 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/SendVerificationMessageWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/SendVerificationMessageWorker.kt
@@ -30,6 +30,10 @@ import im.vector.matrix.android.internal.worker.getSessionComponent
 import timber.log.Timber
 import javax.inject.Inject
 
+/**
+ * Possible previous worker: None
+ * Possible next worker    : None
+ */
 internal class SendVerificationMessageWorker(context: Context,
                                              params: WorkerParameters)
     : CoroutineWorker(context, params) {
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/content/UploadContentWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/content/UploadContentWorker.kt
index d389efc560..e82728da7e 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/content/UploadContentWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/content/UploadContentWorker.kt
@@ -51,6 +51,10 @@ private data class NewImageAttributes(
         val newFileSize: Int
 )
 
+/**
+ * Possible previous worker: None
+ * Possible next worker    : Always [MultipleEventSendingDispatcherWorker]
+ */
 internal class UploadContentWorker(val context: Context, params: WorkerParameters) : CoroutineWorker(context, params) {
 
     @JsonClass(generateAdapter = true)
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/group/GetGroupDataWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/group/GetGroupDataWorker.kt
index 5d63c0bcc0..bb33212f9c 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/group/GetGroupDataWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/group/GetGroupDataWorker.kt
@@ -26,6 +26,10 @@ import im.vector.matrix.android.internal.worker.getSessionComponent
 import timber.log.Timber
 import javax.inject.Inject
 
+/**
+ * Possible previous worker: None
+ * Possible next worker    : None
+ */
 internal class GetGroupDataWorker(context: Context, params: WorkerParameters) : CoroutineWorker(context, params) {
 
     @JsonClass(generateAdapter = true)
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/EncryptEventWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/EncryptEventWorker.kt
index c1528e3ae2..7155d65f9c 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/EncryptEventWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/EncryptEventWorker.kt
@@ -32,6 +32,10 @@ import im.vector.matrix.android.internal.worker.getSessionComponent
 import timber.log.Timber
 import javax.inject.Inject
 
+/**
+ * Possible previous worker: None
+ * Possible next worker    : Always [SendEventWorker]
+ */
 internal class EncryptEventWorker(context: Context, params: WorkerParameters)
     : CoroutineWorker(context, params) {
 
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/MultipleEventSendingDispatcherWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/MultipleEventSendingDispatcherWorker.kt
index 1f89430d27..44a8bc444a 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/MultipleEventSendingDispatcherWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/MultipleEventSendingDispatcherWorker.kt
@@ -24,6 +24,7 @@ import androidx.work.WorkerParameters
 import com.squareup.moshi.JsonClass
 import im.vector.matrix.android.api.session.events.model.Event
 import im.vector.matrix.android.internal.di.WorkManagerProvider
+import im.vector.matrix.android.internal.session.content.UploadContentWorker
 import im.vector.matrix.android.internal.session.room.timeline.TimelineSendEventWorkCommon
 import im.vector.matrix.android.internal.worker.SessionWorkerParams
 import im.vector.matrix.android.internal.worker.WorkerParamsFactory
@@ -35,6 +36,9 @@ import javax.inject.Inject
 
 /**
  * This worker creates a new work for each events passed in parameter
+ *
+ * Possible previous worker: Always [UploadContentWorker]
+ * Possible next worker    : None, but it will post new work to send events, encrypted or not
  */
 internal class MultipleEventSendingDispatcherWorker(context: Context, params: WorkerParameters)
     : CoroutineWorker(context, params) {
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/RedactEventWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/RedactEventWorker.kt
index 473f23910c..7e0b665d63 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/RedactEventWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/RedactEventWorker.kt
@@ -29,6 +29,10 @@ import org.greenrobot.eventbus.EventBus
 import timber.log.Timber
 import javax.inject.Inject
 
+/**
+ * Possible previous worker: None
+ * Possible next worker    : None
+ */
 internal class RedactEventWorker(context: Context, params: WorkerParameters) : CoroutineWorker(context, params) {
 
     @JsonClass(generateAdapter = true)
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/SendEventWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/SendEventWorker.kt
index ab8fd39c3d..d55b9665f6 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/SendEventWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/SendEventWorker.kt
@@ -32,6 +32,10 @@ import org.greenrobot.eventbus.EventBus
 import timber.log.Timber
 import javax.inject.Inject
 
+/**
+ * Possible previous worker: [EncryptEventWorker] or first worker
+ * Possible next worker    : None
+ */
 internal class SendEventWorker(context: Context,
                                params: WorkerParameters)
     : CoroutineWorker(context, params) {
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/sync/job/SyncWorker.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/sync/job/SyncWorker.kt
index 531a18a08c..ab4e1938ce 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/sync/job/SyncWorker.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/sync/job/SyncWorker.kt
@@ -35,6 +35,10 @@ import javax.inject.Inject
 
 private const val DEFAULT_LONG_POOL_TIMEOUT = 0L
 
+/**
+ * Possible previous worker: None
+ * Possible next worker    : None
+ */
 internal class SyncWorker(context: Context,
                           workerParameters: WorkerParameters
 ) : CoroutineWorker(context, workerParameters) {