diff --git a/gzip.1 b/gzip.1
index 8db327d..6aa997b 100644
--- a/gzip.1
+++ b/gzip.1
@@ -229,7 +229,7 @@ For each compressed file, list the following fields:

     compressed size: size of the compressed file
     uncompressed size: size of the uncompressed file
-    ratio: compression ratio (0.0% if unknown)
+    ratio: 1 - compression ratio (0.0% if unknown)
     uncompressed_name: name of the uncompressed file

 The uncompressed size is given as -1 for files not in gzip format,

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