diff --git a/org.springframework.context/src/main/java/org/springframework/context/config/AdviceMode.java b/org.springframework.context/src/main/java/org/springframework/context/config/AdviceMode.java
index 57d9516a68a..347b84bdb13 100644
--- a/org.springframework.context/src/main/java/org/springframework/context/config/AdviceMode.java
+++ b/org.springframework.context/src/main/java/org/springframework/context/config/AdviceMode.java
@@ -17,10 +17,14 @@
 package org.springframework.context.config;
 
 /**
- * TODO SPR-7420: document
+ * Enumeration used to determine whether proxy-based or AspectJ-based advice should be
+ * applied.
  *
  * @author Chris Beams
  * @since 3.1
+ * @see org.springframework.scheduling.annotation.EnableAsync#mode()
+ * @see org.springframework.scheduling.annotation.AsyncConfigurationSelector#selectImports
+ * @see org.springframework.transaction.annotation.EnableTransactionManagement#mode()
  */
 public enum AdviceMode {
 	PROXY,
diff --git a/org.springframework.context/src/main/java/org/springframework/scheduling/annotation/AsyncConfigurationSelector.java b/org.springframework.context/src/main/java/org/springframework/scheduling/annotation/AsyncConfigurationSelector.java
index 2b58b49ed10..a5a00fcfb67 100644
--- a/org.springframework.context/src/main/java/org/springframework/scheduling/annotation/AsyncConfigurationSelector.java
+++ b/org.springframework.context/src/main/java/org/springframework/scheduling/annotation/AsyncConfigurationSelector.java
@@ -38,6 +38,12 @@ import org.springframework.util.Assert;
  */
 public class AsyncConfigurationSelector implements ImportSelector {
 
+	/**
+	 * Import {@link ProxyAsyncConfiguration} if {@link EnableAsync#mode()} equals
+	 * {@code PROXY}, otherwise import
+	 * {@link org.springframework.scheduling.aspectj.AspectJAsyncConfiguration
+	 * AspectJAsyncConfiguration}.
+	 */
 	public String[] selectImports(AnnotationMetadata importingClassMetadata) {
 		Map<String, Object> enableAsync =
 			importingClassMetadata.getAnnotationAttributes(EnableAsync.class.getName());