Index: docs/LibASTMatchersReference.html
===================================================================
--- docs/LibASTMatchersReference.html
+++ docs/LibASTMatchersReference.html
@@ -2611,12 +2611,14 @@
 
 
 <tr><td>Matcher&lt;<a href="http://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>&gt;</td><td class="name" onclick="toggle('isStaticStorageClass0')"><a name="isStaticStorageClass0Anchor">isStaticStorageClass</a></td><td></td></tr>
-<tr><td colspan="4" class="doc" id="isStaticStorageClass0"><pre>Matches variablefunction declarations that have static storage class
-(with "static" key word) written in the source.
+<tr><td colspan="4" class="doc" id="isStaticStorageClass0"><pre>Matches variablefunction declarations that have "static" storage
+class specifier ("static" key word) written in the source.
 
 Given:
   static void f() {}
   static int i = 0;
+  extern int j;
+  int k;
 functionDecl(isStaticStorageClass())
   matches the function declaration f.
 varDecl(isStaticStorageClass())
@@ -3394,15 +3396,19 @@
 
 <tr><td>Matcher&lt;<a href="http://clang.llvm.org/doxygen/classclang_1_1VarDecl.html">VarDecl</a>&gt;</td><td class="name" onclick="toggle('hasStaticStorageDuration0')"><a name="hasStaticStorageDuration0Anchor">hasStaticStorageDuration</a></td><td></td></tr>
 <tr><td colspan="4" class="doc" id="hasStaticStorageDuration0"><pre>Matches a variable declaration that has static storage duration.
+It includes the variable declared at namespace scope and those declared
+with "static" and "extern" storage class specifiers.
 
-Example matches y and a, but not x or z.
-(matcher = varDecl(hasStaticStorageDuration())
 void f() {
   int x;
   static int y;
   thread_local int z;
 }
 int a;
+static int b;
+extern int c;
+varDecl(isStaticStorageClass())
+  matches the function declaration y, a, b and c.
 </pre></td></tr>
 
 
@@ -3488,12 +3494,14 @@
 
 
 <tr><td>Matcher&lt;<a href="http://clang.llvm.org/doxygen/classclang_1_1VarDecl.html">VarDecl</a>&gt;</td><td class="name" onclick="toggle('isStaticStorageClass1')"><a name="isStaticStorageClass1Anchor">isStaticStorageClass</a></td><td></td></tr>
-<tr><td colspan="4" class="doc" id="isStaticStorageClass1"><pre>Matches variablefunction declarations that have static storage class
-(with "static" key word) written in the source.
+<tr><td colspan="4" class="doc" id="isStaticStorageClass1"><pre>Matches variablefunction declarations that have "static" storage
+class specifier ("static" key word) written in the source.
 
 Given:
   static void f() {}
   static int i = 0;
+  extern int j;
+  int k;
 functionDecl(isStaticStorageClass())
   matches the function declaration f.
 varDecl(isStaticStorageClass())
Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -2942,9 +2942,9 @@
 }
 
 /// \brief Matches a variable declaration that has static storage duration.
+/// It includes the variable declared at namespace scope and those declared
+/// with "static" and "extern" storage class specifiers.
 ///
-/// Example matches y and a, but not x or z.
-/// (matcher = varDecl(hasStaticStorageDuration())
 /// \code
 /// void f() {
 ///   int x;
@@ -2952,6 +2952,10 @@
 ///   thread_local int z;
 /// }
 /// int a;
+/// static int b;
+/// extern int c;
+/// varDecl(isStaticStorageClass())
+///   matches the function declaration y, a, b and c.
 /// \endcode
 AST_MATCHER(VarDecl, hasStaticStorageDuration) {
   return Node.getStorageDuration() == SD_Static;
@@ -3387,13 +3391,15 @@
   return Node.isExternC();
 }
 
-/// \brief Matches variable/function declarations that have static storage class
-/// (with "static" key word) written in the source.
+/// \brief Matches variable/function declarations that have "static" storage
+/// class specifier ("static" key word) written in the source.
 ///
 /// Given:
 /// \code
 ///   static void f() {}
 ///   static int i = 0;
+///   extern int j;
+///   int k;
 /// \endcode
 /// functionDecl(isStaticStorageClass())
 ///   matches the function declaration f.
Index: unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
===================================================================
--- unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
+++ unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
@@ -669,7 +669,7 @@
 
 TEST(Matcher, VarDecl_StorageDuration) {
   std::string T =
-    "void f() { int x; static int y; } int a;";
+    "void f() { int x; static int y; } int a;static int b;extern int c;";
 
   EXPECT_TRUE(matches(T, varDecl(hasName("x"), hasAutomaticStorageDuration())));
   EXPECT_TRUE(
@@ -679,6 +679,8 @@
 
   EXPECT_TRUE(matches(T, varDecl(hasName("y"), hasStaticStorageDuration())));
   EXPECT_TRUE(matches(T, varDecl(hasName("a"), hasStaticStorageDuration())));
+  EXPECT_TRUE(matches(T, varDecl(hasName("b"), hasStaticStorageDuration())));
+  EXPECT_TRUE(matches(T, varDecl(hasName("c"), hasStaticStorageDuration())));
   EXPECT_TRUE(notMatches(T, varDecl(hasName("x"), hasStaticStorageDuration())));
 
   // FIXME: It is really hard to test with thread_local itself because not all
@@ -853,6 +855,7 @@
       matches("static void f() {}", functionDecl(isStaticStorageClass())));
   EXPECT_TRUE(matches("static int i = 1;", varDecl(isStaticStorageClass())));
   EXPECT_TRUE(notMatches("int i = 1;", varDecl(isStaticStorageClass())));
+  EXPECT_TRUE(notMatches("extern int i;", varDecl(isStaticStorageClass())));
   EXPECT_TRUE(notMatches("void f() {}", functionDecl(isStaticStorageClass())));
 }