diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index f54436a43..19d0c68e4 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -351,6 +351,7 @@ Variables for CTest
    /variable/CTEST_BUILD_NAME
    /variable/CTEST_BZR_COMMAND
    /variable/CTEST_BZR_UPDATE_OPTIONS
+   /variable/CTEST_CHANGE_ID
    /variable/CTEST_CHECKOUT_COMMAND
    /variable/CTEST_CONFIGURATION_TYPE
    /variable/CTEST_CONFIGURE_COMMAND
diff --git a/Help/variable/CTEST_CHANGE_ID.rst b/Help/variable/CTEST_CHANGE_ID.rst
new file mode 100644
index 000000000..a423f4900
--- /dev/null
+++ b/Help/variable/CTEST_CHANGE_ID.rst
@@ -0,0 +1,9 @@
+CTEST_CHANGE_ID
+---------------
+
+Specify the CTest ``ChangeId`` setting
+in a :manual:`ctest(1)` dashboard client script.
+
+This setting allows CTest to pass arbitrary information about this
+build up to CDash.  One use of this feature is to allow CDash to
+post comments on your pull request if anything goes wrong with your build.
diff --git a/Source/CTest/cmCTestHandlerCommand.cxx b/Source/CTest/cmCTestHandlerCommand.cxx
index 3003e8a1c..3579aee19 100644
--- a/Source/CTest/cmCTestHandlerCommand.cxx
+++ b/Source/CTest/cmCTestHandlerCommand.cxx
@@ -109,6 +109,12 @@ bool cmCTestHandlerCommand
       this->Quiet);
     }
 
+  if(const char* changeId =
+     this->Makefile->GetDefinition("CTEST_CHANGE_ID"))
+    {
+    this->CTest->SetCTestConfiguration("ChangeId", changeId, this->Quiet);
+    }
+
   cmCTestLog(this->CTest, DEBUG, "Initialize handler" << std::endl;);
   cmCTestGenericHandler* handler = this->InitializeHandler();
   if ( !handler )
diff --git a/Source/cmCTest.cxx b/Source/cmCTest.cxx
index 5676dda7b..f65bd297f 100644
--- a/Source/cmCTest.cxx
+++ b/Source/cmCTest.cxx
@@ -1567,6 +1567,13 @@ void cmCTest::StartXML(cmXMLWriter& xml, bool append)
   xml.Attribute("LogicalProcessorsPerPhysical",
                      info.GetLogicalProcessorsPerPhysical());
   xml.Attribute("ProcessorClockFrequency", info.GetProcessorClockFrequency());
+
+  std::string changeId = this->GetCTestConfiguration("ChangeId");
+  if(!changeId.empty())
+    {
+    xml.Attribute("ChangeId", changeId);
+    }
+
   this->AddSiteProperties(xml);
 }
 
diff --git a/Tests/RunCMake/ctest_build/BuildChangeId-check.cmake b/Tests/RunCMake/ctest_build/BuildChangeId-check.cmake
new file mode 100644
index 000000000..074801f88
--- /dev/null
+++ b/Tests/RunCMake/ctest_build/BuildChangeId-check.cmake
@@ -0,0 +1,12 @@
+file(GLOB build_xml_file "${RunCMake_TEST_BINARY_DIR}/Testing/*/Build.xml")
+if(build_xml_file)
+  file(READ "${build_xml_file}" build_xml LIMIT 4096)
+  if(NOT build_xml MATCHES [[ChangeId="&lt;&gt;1"]])
+    string(REPLACE "\n" "\n  " build_xml "  ${build_xml}")
+    set(RunCMake_TEST_FAILED
+      "Build.xml does not have expected ChangeId:\n${build_xml}"
+      )
+  endif()
+else()
+  set(RunCMake_TEST_FAILED "Build.xml not found")
+endif()
diff --git a/Tests/RunCMake/ctest_build/RunCMakeTest.cmake b/Tests/RunCMake/ctest_build/RunCMakeTest.cmake
index c6f732c8d..324f25c50 100644
--- a/Tests/RunCMake/ctest_build/RunCMakeTest.cmake
+++ b/Tests/RunCMake/ctest_build/RunCMakeTest.cmake
@@ -31,3 +31,12 @@ endif()
   endif()
 endfunction()
 run_BuildFailure()
+
+function(run_BuildChangeId)
+  set(CASE_TEST_PREFIX_CODE [[
+    set(CTEST_CHANGE_ID "<>1")
+  ]])
+
+  run_ctest(BuildChangeId)
+endfunction()
+run_BuildChangeId()
diff --git a/Tests/RunCMake/ctest_test/RunCMakeTest.cmake b/Tests/RunCMake/ctest_test/RunCMakeTest.cmake
index 21d0447e5..76dc143f3 100644
--- a/Tests/RunCMake/ctest_test/RunCMakeTest.cmake
+++ b/Tests/RunCMake/ctest_test/RunCMakeTest.cmake
@@ -49,3 +49,13 @@ set(CASE_CTEST_TEST_LOAD "ERR3")
 run_ctest_test(TestLoadOrder TEST_LOAD "ERR4")
 
 unset(ENV{__CTEST_FAKE_LOAD_AVERAGE_FOR_TESTING})
+unset(CASE_CTEST_TEST_LOAD)
+
+function(run_TestChangeId)
+  set(CASE_TEST_PREFIX_CODE [[
+    set(CTEST_CHANGE_ID "<>1")
+  ]])
+
+  run_ctest(TestChangeId)
+endfunction()
+run_TestChangeId()
diff --git a/Tests/RunCMake/ctest_test/TestChangeId-check.cmake b/Tests/RunCMake/ctest_test/TestChangeId-check.cmake
new file mode 100644
index 000000000..b9884f1ec
--- /dev/null
+++ b/Tests/RunCMake/ctest_test/TestChangeId-check.cmake
@@ -0,0 +1,12 @@
+file(GLOB test_xml_file "${RunCMake_TEST_BINARY_DIR}/Testing/*/Test.xml")
+if(test_xml_file)
+  file(READ "${test_xml_file}" test_xml LIMIT 4096)
+  if(NOT test_xml MATCHES [[ChangeId="&lt;&gt;1"]])
+    string(REPLACE "\n" "\n  " test_xml "  ${test_xml}")
+    set(RunCMake_TEST_FAILED
+      "Test.xml does not have expected ChangeId:\n${test_xml}"
+      )
+  endif()
+else()
+  set(RunCMake_TEST_FAILED "Test.xml not found")
+endif()
diff --git a/Tests/RunCMake/ctest_test/test.cmake.in b/Tests/RunCMake/ctest_test/test.cmake.in
index a8de6a361..50b936d31 100644
--- a/Tests/RunCMake/ctest_test/test.cmake.in
+++ b/Tests/RunCMake/ctest_test/test.cmake.in
@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.1)
+@CASE_TEST_PREFIX_CODE@
 
 set(CTEST_SITE                          "test-site")
 set(CTEST_BUILD_NAME                    "test-build-name")