diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index 05a7b334e1..e622784bc0 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -190,6 +190,8 @@ Variables that Describe the System
    /variable/MSVC_VERSION
    /variable/UNIX
    /variable/WIN32
+   /variable/WINDOWS_PHONE
+   /variable/WINDOWS_STORE
    /variable/XCODE_VERSION
 
 Variables that Control the Build
diff --git a/Help/variable/WINDOWS_PHONE.rst b/Help/variable/WINDOWS_PHONE.rst
new file mode 100644
index 0000000000..61d91b00aa
--- /dev/null
+++ b/Help/variable/WINDOWS_PHONE.rst
@@ -0,0 +1,5 @@
+WINDOWS_PHONE
+-------------
+
+True when the :variable:`CMAKE_SYSTEM_NAME` variable is set
+to ``WindowsPhone``.
diff --git a/Help/variable/WINDOWS_STORE.rst b/Help/variable/WINDOWS_STORE.rst
new file mode 100644
index 0000000000..dae3b539b7
--- /dev/null
+++ b/Help/variable/WINDOWS_STORE.rst
@@ -0,0 +1,5 @@
+WINDOWS_STORE
+-------------
+
+True when the :variable:`CMAKE_SYSTEM_NAME` variable is set
+to ``WindowsStore``.
diff --git a/Modules/Platform/Windows.cmake b/Modules/Platform/Windows.cmake
index 7e97111dcd..9a937a7e8f 100644
--- a/Modules/Platform/Windows.cmake
+++ b/Modules/Platform/Windows.cmake
@@ -2,6 +2,10 @@ set(WIN32 1)
 
 if(CMAKE_SYSTEM_NAME STREQUAL "WindowsCE")
   set(WINCE 1)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "WindowsPhone")
+  set(WINDOWS_PHONE 1)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+  set(WINDOWS_STORE 1)
 endif()
 
 set(CMAKE_STATIC_LIBRARY_PREFIX "")