CMakeDependentOption: Document that 4th parameter follows if-syntax
diff --git a/Help/command/if.rst b/Help/command/if.rst
index d8e3a45..be992df 100644
--- a/Help/command/if.rst
+++ b/Help/command/if.rst
@@ -29,6 +29,8 @@
repeat of the argument of the opening
``if`` command.
+.. _`Condition Syntax`:
+
Condition Syntax
^^^^^^^^^^^^^^^^
diff --git a/Modules/CMakeDependentOption.cmake b/Modules/CMakeDependentOption.cmake
index 6046d85..99d5070 100644
--- a/Modules/CMakeDependentOption.cmake
+++ b/Modules/CMakeDependentOption.cmake
@@ -12,7 +12,7 @@
is used, but any value set by the user is preserved for when the
option is presented again. Example invocation:
-::
+.. code-block:: cmake
CMAKE_DEPENDENT_OPTION(USE_FOO "Use Foo" ON
"USE_BAR;NOT USE_ZOT" OFF)
@@ -21,7 +21,8 @@
called USE_FOO that defaults to ON. Otherwise, it sets USE_FOO to
OFF. If the status of USE_BAR or USE_ZOT ever changes, any value for
the USE_FOO option is saved so that when the option is re-enabled it
-retains its old value.
+retains its old value. Each element in the fourth parameter is
+evaluated as an if-condition, so :ref:`Condition Syntax` can be used.
#]=======================================================================]
macro(CMAKE_DEPENDENT_OPTION option doc default depends force)
