CheckTypeSize: Document default language
When LANGUAGE keyword is not provided default language for the
check_type_size is C.
diff --git a/Modules/CheckTypeSize.cmake b/Modules/CheckTypeSize.cmake
index ee54d92..17fdde2 100644
--- a/Modules/CheckTypeSize.cmake
+++ b/Modules/CheckTypeSize.cmake
@@ -54,6 +54,7 @@
``LANGUAGE <language>``
Use the ``<language>`` compiler to perform the check.
Acceptable values are ``C`` and ``CXX``.
+ If not specified, it defaults to ``C``.
Despite the name of the macro you may use it to check the size of more
complex expressions, too. To check e.g. for the size of a struct
