diff --git a/surefire-api/src/main/java/org/apache/maven/surefire/api/booter/MasterProcessChannelEncoder.java b/surefire-api/src/main/java/org/apache/maven/surefire/api/booter/MasterProcessChannelEncoder.java
index c2c4886ba2..193929504d 100644
--- a/surefire-api/src/main/java/org/apache/maven/surefire/api/booter/MasterProcessChannelEncoder.java
+++ b/surefire-api/src/main/java/org/apache/maven/surefire/api/booter/MasterProcessChannelEncoder.java
@@ -34,49 +34,168 @@
  */
 public interface MasterProcessChannelEncoder
 {
+    /**
+     * @return {@code true} if the encoder's stream has got an error
+     */
     boolean checkError();
 
+    /**
+     * Called on JVM exit error.
+     */
     void onJvmExit();
 
+    /**
+     * System properties after the test set has finished.
+     *
+     * @param sysProps  system properties handled after the test set tear down
+     * @param runMode   the run mode of particular test set
+     * @param testRunId the test set identification
+     */
     void systemProperties( Map<String, String> sysProps, RunMode runMode, Long testRunId );
 
+    /**
+     * The test set has started.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testSetStarting( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test set has finished.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testSetCompleted( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test has started.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testStarting( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test has succeeded.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testSucceeded( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test has failed.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testFailed( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test is skipped.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testSkipped( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test error.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testError( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * The test assumption failure.
+     *
+     * @param reportEntry     test set report entry
+     * @param trimStackTraces {@code true} if stack trace trimming
+     */
     void testAssumptionFailure( ReportEntry reportEntry, boolean trimStackTraces );
 
+    /**
+     * Test output, a line or characters.
+     *
+     * @param reportEntry std/out or std/err context
+     */
     void testOutput( TestOutputReportEntry reportEntry );
 
+    /**
+     * Info log.
+     *
+     * @param msg message of info logger
+     */
     void consoleInfoLog( String msg );
 
+    /**
+     * Error log.
+     *
+     * @param msg message of error logger
+     */
     void consoleErrorLog( String msg );
 
+    /**
+     * Error log.
+     *
+     * @param t exception
+     */
     void consoleErrorLog( Throwable t );
 
+    /**
+     * Error log.
+     *
+     * @param msg additional error message
+     * @param t   exception
+     */
     void consoleErrorLog( String msg, Throwable t );
 
+    /**
+     * Error log.
+     *
+     * @param stackTraceWriter printable stack trace
+     * @param trimStackTraces  {@code true} if selected trimmed stack trace to print into encoder channel/stream
+     */
     void consoleErrorLog( StackTraceWriter stackTraceWriter, boolean trimStackTraces );
 
+    /**
+     * Debug log.
+     *
+     * @param msg message of debug logger
+     */
     void consoleDebugLog( String msg );
 
+    /**
+     * Warning log.
+     *
+     * @param msg message of warning logger
+     */
     void consoleWarningLog( String msg );
 
+    /**
+     * Say BYE on exit.
+     * ForkBooter will consequently wait for BYE_ACK command which finally drains the (std/in) sink channel.
+     */
     void bye();
 
+    /**
+     * The provider wants to stop the progress.
+     */
     void stopOnNextTest();
 
+    /**
+     * The provider acquires a new test set to run.
+     */
     void acquireNextTest();
 
+    /**
+     * ForkedBooter tear down has failed while waiting for BYE_ACK command.
+     *
+     * @param stackTraceWriter printable stack trace
+     * @param trimStackTraces  {@code true} if selected trimmed stack trace to print into encoder channel/stream
+     */
     void sendExitError( StackTraceWriter stackTraceWriter, boolean trimStackTraces );
 }