diff --git a/doc/api/buffer.md b/doc/api/buffer.md
index ad5b9b762e9909..c2e91f419c8cf3 100644
--- a/doc/api/buffer.md
+++ b/doc/api/buffer.md
@@ -6,6 +6,11 @@
 
 <!-- source_link=lib/buffer.js -->
 
+In Node.js, `Buffer` objects are used to represent binary data in the form
+of a sequence of bytes. Many Node.js APIs, for example streams and file system
+operations, support `Buffer`s, as interactions with the operating system or
+other processes generally always happen in terms of binary data.
+
 `Buffer` objects are used to represent a fixed-length sequence of bytes. Many
 Node.js APIs support `Buffer`s.
 
diff --git a/doc/api/fs.md b/doc/api/fs.md
index 457df39bc310a0..305a81a95ffb28 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -8,8 +8,8 @@
 
 <!-- source_link=lib/fs.js -->
 
-The `fs` module enables interacting with the file system in a
-way modeled on standard POSIX functions.
+The `fs` module provides an API for interacting with the file system in a
+manner closely modeled around standard POSIX functions.
 
 To use this module:
 
diff --git a/src/node_report.cc b/src/node_report.cc
index e7bfe7fef09d14..1faa0903fc6025 100644
--- a/src/node_report.cc
+++ b/src/node_report.cc
@@ -43,9 +43,12 @@ using v8::HeapSpaceStatistics;
 using v8::HeapStatistics;
 using v8::Isolate;
 using v8::Local;
+using v8::Number;
 using v8::Object;
+using v8::StackTrace;
 using v8::String;
 using v8::TryCatch;
+using v8::Value;
 using v8::V8;
 using v8::Value;