diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 7c1279f..13e2664 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -57,6 +57,7 @@ Supporting sections:
* [Appendix A: Libraries](#S-libraries)
* [Appendix B: Modernizing code](#S-modernizing)
* [Appendix C: Discussion](#S-discussion)
+* [Appendix D: Tools support](#S-tools)
* [Glossary](#S-glossary)
* [To-do: Unclassified proto-rules](#S-unclassified)
@@ -426,6 +427,7 @@ Supporting sections:
* [Appendix A: Libraries](#S-libraries)
* [Appendix B: Modernizing code](#S-modernizing)
* [Appendix C: Discussion](#S-discussion)
+* [Appendix D: Tools support](#S-tools)
* [Glossary](#S-glossary)
* [To-do: Unclassified proto-rules](#S-unclassified)
@@ -2613,7 +2615,7 @@ Member functions defined in-class are `inline` by default.
##### Exception
-Template functions (incl. template member functions) must be in headers and therefore inline.
+Template functions (incl. template member functions) are normally defined in headers and therefore inline.
##### Enforcement
@@ -21140,6 +21142,20 @@ It is common to need an initial set of elements.
When is a class a container? ???
+# Appendix D: Supporting tools
+
+This section contains a list of tools that directly support adoption of the C++ Core Guidelines. This list is not intended to be an exhaustive list of tools
+that are helpful in writing good C++ code. If a tool is designed specifically to support and links to the C++ Core Guidelines it is a candidate for inclusion.
+In particular, here we present further rationale, longer examples, and discussions of alternatives.
+
+### Tools: [Clang-tidy](http://clang.llvm.org/extra/clang-tidy/checks/list.html)
+
+Clang-tidy has a set of rules that specifically enforce the C++ Core Guidelines. These rules are named in the pattern `cppcoreguidelines-*`.
+
+### Tools: [CppCoreCheck](https://docs.microsoft.com/en-us/visualstudio/code-quality/using-the-cpp-core-guidelines-checkers)
+
+The Microsoft compiler's C++ code analysis contains a set of rules specifically aimed at enforcement of the C++ Core Guidelines.
+
# Glossary
A relatively informal definition of terms used in the guidelines