Added Exception Handling entry to document/core/appendix/changes.rst (#267)

Co-authored-by: Andreas Rossberg <[email protected]>

Author: ioannad

document/core/appendix/changes.rst

@@ -138,6 +138,22 @@ Added vector type and instructions that manipulate multiple numeric values in pa
 * New injection/projection :ref:`vector instructions <syntax-instr-vec>`: :math:`\K{i}\!N\!\K{x}\!M\!\K{.splat}`, :math:`\K{f}\!N\!\K{x}\!M\!\K{.splat}`, :math:`\K{i}\!N\!\K{x}\!M\!\K{.bitmask}`
 
 
+.. index:: instructions, exception, tag type, tag, handler
+
+Exception Handling
+..................
+
+Added tag definitions, imports, and exports, and instructions to throw and catch exceptions [#proposal-exceptions]_
+
+* Modules may :ref:`define <syntax-tagtype>`, :ref:`import <syntax-import>`, and :ref:`export <syntax-export>` tags.
+
+* New exception throwing :ref:`control instructions <syntax-instr-control>`: :math:`\THROW` and :math:`\RETHROW`.
+
+* New handler :ref:`control instructions <syntax-instr-control>`: :math:`(\TRY~\X{bt}~\instr_1^\ast~(\CATCH~x~\instr_2^\ast)^\ast~(\CATCHALL~\instr_3^\ast)^?\END)` and :math:`(\TRY~\X{bt}~\instr^\ast~\DELEGATE~l)`.
+
+* New :ref:`tag section <binary-tagsec>` in binary format.
+
+
 .. [#proposal-signext]
    https://github.com/WebAssembly/spec/tree/main/proposals/sign-extension-ops/
 
@@ -155,3 +171,6 @@ Added vector type and instructions that manipulate multiple numeric values in pa
 
 .. [#proposal-vectype]
    https://github.com/WebAssembly/spec/tree/main/proposals/simd/
+
+.. [#proposal-exceptions]
+   https://github.com/WebAssembly/spec/tree/main/proposals/exception-handling/