docs: Add documentation that compiler plugins are hashed too (#1006)

diff --git a/doc/MANUAL.adoc b/doc/MANUAL.adoc
index 91125685b88d30640bac043d8d233764a71c22be..5983b7468fd52d9a8e8900c913adc241f8bdaeed 100644 (file)
--- a/doc/MANUAL.adoc
+++ b/doc/MANUAL.adoc
@@ -437,8 +437,9 @@ invocation you can use the `-d`/`--dir` command line option instead.
 
     By default, ccache includes the modification time ("`mtime`") and size of
     the compiler in the hash to ensure that results retrieved from the cache
-    are accurate. This option can be used to select another strategy. Possible
-    values are:
+    are accurate. If compiler plugins are used, these plugins will also be 
+    added to the hash. This option can be used to select another strategy.
+    Possible values are:
 +
 --
 *content*::