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-rw-r--r--Help/command/add_custom_command.rst10
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diff --git a/Help/command/add_custom_command.rst b/Help/command/add_custom_command.rst
index d038406..1b0aa14 100644
--- a/Help/command/add_custom_command.rst
+++ b/Help/command/add_custom_command.rst
@@ -225,3 +225,13 @@ of the following is specified:
:command:`add_custom_target` command.
``POST_BUILD``
Run after all other rules within the target have been executed.
+
+.. note::
+ Because generator expressions can be used in custom commands,
+ it is possible to define ``COMMAND`` lines or whole custom commands
+ which evaluate to empty strings for certain configurations.
+ For **Visual Studio 2010 (and newer)** generators these command
+ lines or custom commands will be omitted for the specific
+ configuration and no "empty-string-command" will be added.
+
+ This allows to add individual build events for every configuration.