diff options
| -rw-r--r-- | docs/LanguageExtensions.rst | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst index be54402fd3..2abbea7da6 100644 --- a/docs/LanguageExtensions.rst +++ b/docs/LanguageExtensions.rst @@ -140,7 +140,8 @@ Include File Checking Macros Not all developments systems have the same include files. The :ref:`langext-__has_include` and :ref:`langext-__has_include_next` macros allow you to check for the existence of an include file before doing a possibly -failing ``#include`` directive. +failing ``#include`` directive. Include file checking macros must be used +as expressions in #if or #elif preprocessing directives. .. _langext-__has_include: |