diff --git a/org.springframework.core/src/main/java/org/springframework/core/env/MapPropertySource.java b/org.springframework.core/src/main/java/org/springframework/core/env/MapPropertySource.java
index 3fbc6378ffc..05eec722614 100644
--- a/org.springframework.core/src/main/java/org/springframework/core/env/MapPropertySource.java
+++ b/org.springframework.core/src/main/java/org/springframework/core/env/MapPropertySource.java
@@ -19,15 +19,15 @@ package org.springframework.core.env;
 import java.util.Map;
 
 /**
- * {@link PropertySource} that reads keys and values from a {@code Map<String,String>} object.
+ * {@link PropertySource} that reads keys and values from a {@code Map} object.
  *
  * @author Chris Beams
  * @since 3.1
  * @see PropertiesPropertySource
  */
-public class MapPropertySource extends EnumerablePropertySource<Map<String, ? super Object>> {
+public class MapPropertySource extends EnumerablePropertySource<Map<String, Object>> {
 
-	protected MapPropertySource(String name, Map<String, ? super Object> source) {
+	protected MapPropertySource(String name, Map<String, Object> source) {
 		super(name, source);
 	}
 
diff --git a/org.springframework.core/src/main/java/org/springframework/core/env/MutablePropertySources.java b/org.springframework.core/src/main/java/org/springframework/core/env/MutablePropertySources.java
index 418d7572b19..b05f78c1a67 100644
--- a/org.springframework.core/src/main/java/org/springframework/core/env/MutablePropertySources.java
+++ b/org.springframework.core/src/main/java/org/springframework/core/env/MutablePropertySources.java
@@ -87,7 +87,7 @@ public class MutablePropertySources implements PropertySources {
 	}
 
 	/**
-	 * Add the given property source object with precedence immediately greater
+	 * Add the given property source object with precedence immediately higher
 	 * than the named relative property source.
 	 */
 	public void addBefore(String relativePropertySourceName, PropertySource<?> propertySource) {
@@ -98,7 +98,7 @@ public class MutablePropertySources implements PropertySources {
 	}
 
 	/**
-	 * Add the given property source object with precedence immediately less than
+	 * Add the given property source object with precedence immediately lower than
 	 * than the named relative property source.
 	 */
 	public void addAfter(String relativePropertySourceName, PropertySource<?> propertySource) {