diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/cache/CacheStrategy.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/cache/CacheStrategy.kt
index 2880d851d6..5e2b1b0aff 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/cache/CacheStrategy.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/cache/CacheStrategy.kt
@@ -17,13 +17,19 @@
 package org.matrix.android.sdk.api.cache
 
 sealed class CacheStrategy {
-    // Data is always fetched from the server
+    /**
+     * Data is always fetched from the server
+     */
     object NoCache : CacheStrategy()
 
-    // Once data is retrieved, it is stored for the provided amount of time.
-    // In case of error, and if strict is set to false, the cache can be returned if available
+    /**
+     * Once data is retrieved, it is stored for the provided amount of time.
+     * In case of error, and if strict is set to false, the cache can be returned if available
+     */
     data class TtlCache(val validityDurationInMillis: Long, val strict: Boolean) : CacheStrategy()
 
-    // Once retrieved, the data is stored in cache and will be always get from the cache
+    /**
+     * Once retrieved, the data is stored in cache and will be always get from the cache
+     */
     object InfiniteCache : CacheStrategy()
 }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/failure/Failure.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/failure/Failure.kt
index be139fd82b..4ded8bc47e 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/failure/Failure.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/failure/Failure.kt
@@ -37,7 +37,9 @@ sealed class Failure(cause: Throwable? = null) : Throwable(cause = cause) {
     data class ServerError(val error: MatrixError, val httpCode: Int) : Failure(RuntimeException(error.toString()))
     object SuccessError : Failure(RuntimeException(RuntimeException("SuccessResult is false")))
 
-    // When server send an error, but it cannot be interpreted as a MatrixError
+    /**
+     * When server send an error, but it cannot be interpreted as a MatrixError
+     */
     data class OtherServerError(val errorBody: String, val httpCode: Int) : Failure(RuntimeException("HTTP $httpCode: $errorBody"))
 
     data class RegistrationFlowError(val registrationFlowResponse: RegistrationFlowResponse) : Failure(RuntimeException(registrationFlowResponse.toString()))
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/crypto/verification/VerificationTxState.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/crypto/verification/VerificationTxState.kt
index 39de2cc712..0f8f4cd987 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/crypto/verification/VerificationTxState.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/crypto/verification/VerificationTxState.kt
@@ -17,10 +17,14 @@
 package org.matrix.android.sdk.api.session.crypto.verification
 
 sealed class VerificationTxState {
-    // Uninitialized state
+    /**
+     * Uninitialized state
+     */
     object None : VerificationTxState()
 
-    // Specific for SAS
+    /**
+     * Specific for SAS
+     */
     abstract class VerificationSasTxState : VerificationTxState()
 
     object SendingStart : VerificationSasTxState()
@@ -38,18 +42,26 @@ sealed class VerificationTxState {
     object MacSent : VerificationSasTxState()
     object Verifying : VerificationSasTxState()
 
-    // Specific for QR code
+    /**
+     * Specific for QR code
+     */
     abstract class VerificationQrTxState : VerificationTxState()
 
-    // Will be used to ask the user if the other user has correctly scanned
+    /**
+     * Will be used to ask the user if the other user has correctly scanned
+     */
     object QrScannedByOther : VerificationQrTxState()
     object WaitingOtherReciprocateConfirm : VerificationQrTxState()
 
-    // Terminal states
+    /**
+     * Terminal states
+     */
     abstract class TerminalTxState : VerificationTxState()
 
     object Verified : TerminalTxState()
 
-    // Cancelled by me or by other
+    /**
+     * Cancelled by me or by other
+     */
     data class Cancelled(val cancelCode: CancelCode, val byMe: Boolean) : TerminalTxState()
 }