Improve documentation of file_stat_matches_ctime

diff --git a/doc/MANUAL.adoc b/doc/MANUAL.adoc
index 283e5525f27101b022769178e24285c9fc8b5fca..6bde4c2b28469df819b7286f7463dede15fd814d 100644 (file)
--- a/doc/MANUAL.adoc
+++ b/doc/MANUAL.adoc
@@ -526,8 +526,8 @@ still has to do _some_ preprocessing (like macros).
     the cached version. With this option set, ccache will consider a file as
     matching its cached version if the mtimes and ctimes match.
 *file_stat_matches_ctime*::
-    By default, ccache will not consider a file as matching its cached
-    version if the ctimes do not match. This option disables that check.
+    Ignore ctimes when *file_stat_matches* is enabled. This can be useful when
+    backdating files' mtimes in a controlled way.
 *include_file_ctime*::
     By default, ccache also will not cache a file if it includes a header whose
     ctime is too new. This option disables that check.