[CMake] optional parameters in add_custom_target?

[hex]

The function is defined as

*add_custom_target(Name [ALL] [command1 [args1...]]**
**   [COMMAND command2 [args2...] ...]**
**   [DEPENDS depend depend depend ... ]**
**   [BYPRODUCTS [files...]]**
**   [WORKING_DIRECTORY dir]**
**   [COMMENT comment]**
**   [VERBATIM] [USES_TERMINAL]**
**   [COMMAND_EXPAND_LISTS]**
**   [SOURCES src1 [src2...]]**
**)*

While its arguments are all documented, I am confused about its optional 
parameters:

*add_custom_target(Name [ALL] [command1 [args1...]]*

- ALL: target depends on ALL

- command1 [args1...]]: ???


What means command1 [args1...]]? Or, should this read

*add_custom_target(Name [ALL] [COMMAND command1 [args1...]]**
**   [COMMAND command2 [args2...] ...]*

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