add changelog entry and documentation

jlaehne · Jan 29, 2024 · d5240e9 · d5240e9
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diff --git a/doc/dev_guide/writing_extensions.rst b/doc/dev_guide/writing_extensions.rst
@@ -188,6 +188,12 @@ the signal subclass with ``Electron Energy Loss Spectroscopy`` signal type.
 It is good practice to choose a very explicit ``signal_type`` while leaving
 acronyms for ``signal_type_aliases``.
 
+Additionally, the optional key ``hidden: True`` can be defined if a signal should
+be registered with HyperSpy, but not listed by :meth:`~.api.print_known_signal_types`.
+This option can be used if a signal subclass is needed for certain functionalities,
+such as casting to a different signal subclass, but should usually not be set
+directly by the user.
+
 Creating new HyperSpy model components
 --------------------------------------
 

diff --git a/upcoming_changes/3302.enhancements.rst b/upcoming_changes/3302.enhancements.rst
@@ -0,0 +1 @@
+Allow setting optional ``hidden`` key in definition of signals extending hyperspy, which prevents them from being shown by ``print_known_signal_types()``.
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		Allow setting optional ``hidden`` key in definition of signals extending hyperspy, which prevents them from being shown by ``print_known_signal_types()``.