diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index f5c02d647..869667a88 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -2168,8 +2168,7 @@ class GenericDocument : public GenericValue<Encoding, Allocator> {
     }
 #endif
 
-    // Allow assignment from ValueType.
-    // Refer to Effective C++ 3rd Edition/Item 33: Avoid hiding inherited names.
+    // Allow assignment like a ValueType.
     using ValueType::operator=;
 
     //! Exchange the contents of this document with those of another.
@@ -2188,7 +2187,6 @@ class GenericDocument : public GenericValue<Encoding, Allocator> {
     }
 
     // Allow Swap from ValueType.
-    // Refer to Effective C++ 3rd Edition/Item 33: Avoid hiding inherited names.
     using ValueType::Swap;
 
     //! free-standing swap function helper
diff --git a/test/unittest/documenttest.cpp b/test/unittest/documenttest.cpp
index 9ff8096fa..0d08b2588 100644
--- a/test/unittest/documenttest.cpp
+++ b/test/unittest/documenttest.cpp
@@ -661,17 +661,25 @@ TYPED_TEST(DocumentMove, MoveAssignmentStack) {
 
 // Issue 22: Memory corruption via operator= from Document
 // Fixed by making unimplemented assignment operator private.
-// Prohibit assignment from Document, But allow assignment from Value
+// Prohibit assignment from Document.
+// But allow assignment from ValueType/int/double/..., like a ValueType
 TEST(Document, Assignment) {
 //  Document d1;
 //  Document d2;
 //  d1 = d2;
 
-    Value x(1234);
     Document d;
+
+    Value x(1234);
     d = x;
     EXPECT_TRUE(x.IsNull());    // move semantic
     EXPECT_EQ(1234, d.GetInt());
+
+    d = 1;
+    EXPECT_EQ(1, d.GetInt());
+
+    d = 12.34;
+    EXPECT_NEAR(12.34, d.GetDouble(), 0.0);
 }
 
 #ifdef __clang__