Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -63,11 +63,82 @@
 explain them more clearly, and provide more accurate fix-its for the issues
 identified.  The improvements since the 3.8 release include:
 
+- New ``cert-env33-c`` check
+
+  This check flags calls to ``system()``, ``popen()``, and ``_popen()``, which
+  execute a command processor.
+
+- New ``cert-flp30-c`` check
+
+  This check flags ``for`` loops where the induction expression has a floating-
+  point type.
+
+- New ``cppcoreguidelines-pro-type-member-init`` check
+
+  The check flags user-defined constructor definitions that do not initialize
+  all builtin and pointer fields which leaves their memory in an undefined
+  state.
+
+- New ``misc-dangling-handle`` check
+
+  This check detects dangling references in value handlers like
+  `std::experimental::string_view`.
+
+- New ``misc-forward-declaration-namespace`` check
+
+  This check checks if an unused forward declaration is in a wrong namespace.
+
+- New ``misc-misplaced-widening-cast`` check
+
+  This check warns when there is a explicit redundant cast of a calculation
+  result to a bigger type.
+
+- New ``misc-suspicious-semicolon`` check
+
+  This check finds most instances of stray semicolons that unexpectedly alter
+  the meaning of the code.
+
+- New ``modernize-deprecated-headers`` check
+
+  This check replaces C standard library headers with their C++ alternatives.
+
 - New ``modernize-raw-string-literal`` check
 
   This check selectively replaces string literals containing escaped
   characters with raw string literals.
 
+- New ``performance-faster-string-find`` check
+
+  Optimize calls to std::string::find() and friends when the needle passed is a
+  single character string literal.
+
+- New ``performance-implicit-cast-in-loop`` check
+
+  This check warns about range-based loop with loop variable of const ref type
+  where the type of the variable does not match the one returned by the
+  iterator.
+
+- New ``performance-unnecessary-value-param`` check
+
+  This check flags value parameter declarations of expensive to copy types that
+  are copied for each invocation but it would suffice to pass them by const
+  reference.
+
+- New ``readability-redundant-control-flow`` check
+
+  This check looks for procedures (functions returning no value) with `return`
+  statements at the end of the function.  Such `return` statements are
+  redundant.
+
+- New ``readability-redundant-string-init`` check
+
+  This check finds unnecessary string initializations.
+
+Fixed bugs:
+
+  Crash when ``clang-tidy`` runs on compile database with relative source files
+  paths.
+
 Improvements to ``modularize``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^