diff --git a/cmd/ractool/data.go b/cmd/ractool/data.go
index ce2f2a5..14f4945 100644
--- a/cmd/ractool/data.go
+++ b/cmd/ractool/data.go
@@ -28,7 +28,7 @@
 When encoding, the input is partitioned into chunks and each chunk is
 compressed independently. You can specify the target chunk size in terms of
 either its compressed size or decompressed size. By default (if both
--cchunksize and -dchunksize are zero), a 64KiB -cchunksize is used.
+-cchunksize and -dchunksize are zero), a 64KiB -dchunksize is used.
 
 You can also specify a -cpagesize, which is similar to but not exactly the same
 concept as alignment. If non-zero, padding is inserted into the output to
diff --git a/cmd/ractool/main.go b/cmd/ractool/main.go
index cf5b79b..075a3d1 100644
--- a/cmd/ractool/main.go
+++ b/cmd/ractool/main.go
@@ -31,7 +31,7 @@
 When encoding, the input is partitioned into chunks and each chunk is
 compressed independently. You can specify the target chunk size in terms of
 either its compressed size or decompressed size. By default (if both
--cchunksize and -dchunksize are zero), a 64KiB -cchunksize is used.
+-cchunksize and -dchunksize are zero), a 64KiB -dchunksize is used.
 
 You can also specify a -cpagesize, which is similar to but not exactly the same
 concept as alignment. If non-zero, padding is inserted into the output to
@@ -256,7 +256,7 @@
 	if (*cchunksizeFlag != 0) && (*dchunksizeFlag != 0) {
 		return errors.New("must specify none or one of -cchunksize or -dchunksize")
 	} else if (*cchunksizeFlag == 0) && (*dchunksizeFlag == 0) {
-		*cchunksizeFlag = 65536 // 64 KiB.
+		*dchunksizeFlag = 65536 // 64 KiB.
 	}
 
 	switch *codecFlag {