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-rw-r--r--Help/command/add_custom_command.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Help/command/add_custom_command.rst b/Help/command/add_custom_command.rst
index 4fe9326..9e60d2d 100644
--- a/Help/command/add_custom_command.rst
+++ b/Help/command/add_custom_command.rst
@@ -425,6 +425,11 @@ of the following is specified:
``POST_BUILD``
Run after all other rules within the target have been executed.
+Projects should always specify one of the above three keywords when using
+the ``TARGET`` form. For backward compatibility reasons, ``POST_BUILD`` is
+assumed if no such keyword is given, but projects should explicitly provide
+one of the keywords to make clear the behavior they expect.
+
.. note::
Because generator expressions can be used in custom commands,
it is possible to define ``COMMAND`` lines or whole custom commands