Include information about the benchmark output/methodology

Addresses #930

diff --git a/programs/zstd.1.md b/programs/zstd.1.md
index eea68548982ecd8405b61adc5bc0d3ac23eda993..9e4c5d305550a54a9800d6b30e977bb9078680cb 100644 (file)
--- a/programs/zstd.1.md
+++ b/programs/zstd.1.md
@@ -258,6 +258,9 @@ BENCHMARK
 * `--priority=rt`:
     set process priority to real-time
 
+**Output Format:** CompressionLevel#Filename : IntputSize -> OutputSize (CompressionRatio), CompressionSpeed, DecompressionSpeed
+
+**Methodology:** For both compression and decompression speed, the entire input is compressed/decompressed in-memory to measure speed. A run lasts at least 1 sec, so when files are small, they are compressed/decompressed several times per run, in order to improve measurement accuracy.
 
 ADVANCED COMPRESSION OPTIONS
 ----------------------------