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-rw-r--r--doc/zlib.n7
1 files changed, 4 insertions, 3 deletions
diff --git a/doc/zlib.n b/doc/zlib.n
index 9fa83c6..a4ff7f8 100644
--- a/doc/zlib.n
+++ b/doc/zlib.n
@@ -200,9 +200,10 @@ data corruption.
.TP
\fB\-checksum\fR
.
-This read-only option, valid for both compressing and decompressing
-transforms, gets the current checksum for the uncompressed data that the
-compression engine has seen so far. The compression algorithm depends on what
+This read-only option gets the current checksum for the uncompressed data
+that the compression engine has seen so far. It is valid for both
+compressing and decompressing transforms, but not for the raw inflate
+and deflate formats. The compression algorithm depends on what
format is being produced or consumed.
.TP
\fB\-header\fR