Add note about keep_comments_cpp to NEWS

diff --git a/NEWS.txt b/NEWS.txt
index 9b03b0f0a4b2d8aa2d9150b591a6b5f8f6a1d2e3..e7d64a9b6fe72d921832ffd337ee0ca69d7de24a 100644 (file)
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -34,6 +34,10 @@ New features and improvements
   This allows for cache hits even when `hash_dir` is used in combination with
   `base_dir`.
 
+- Added new `keep_comments_cpp` (`CCACHE_COMMENTS`) configuration option, which
+  tells ccache not to discard the comments before hashing preprocessor output.
+  This can be used to check documentation with *-Wdocumentation*.
+
 
 Bug fixes
 ~~~~~~~~~