doc: Correct default compression level

diff --git a/doc/MANUAL.adoc b/doc/MANUAL.adoc
index a4c07c9c58751ee243238ec6109147abdb0876b8..6a8a4bcd2a31207d2fd9af8bd7fcf3c1fba4ace2 100644 (file)
--- a/doc/MANUAL.adoc
+++ b/doc/MANUAL.adoc
@@ -827,7 +827,7 @@ Cache compression
 -----------------
 
 ccache will by default compress all data it puts into the cache using the
-compression algorithm Zstandard (zstd) using compression level -1. The algorithm
+compression algorithm Zstandard (zstd) using compression level 1. The algorithm
 is fast enough that there should be little reason to turn off compression to
 gain performance. One exception is if the cache is located on a compressed file
 system, in which case the compression performed by ccache of course is