diff --git a/zstd/encoder_options.go b/zstd/encoder_options.go
index faaf81921c..20671dcb91 100644
--- a/zstd/encoder_options.go
+++ b/zstd/encoder_options.go
@@ -94,7 +94,7 @@ func WithEncoderConcurrency(n int) EOption {
 // The value must be a power of two between MinWindowSize and MaxWindowSize.
 // A larger value will enable better compression but allocate more memory and,
 // for above-default values, take considerably longer.
-// The default value is determined by the compression level.
+// The default value is determined by the compression level and max 8MB.
 func WithWindowSize(n int) EOption {
 	return func(o *encoderOptions) error {
 		switch {
@@ -232,9 +232,9 @@ func WithEncoderLevel(l EncoderLevel) EOption {
 			case SpeedDefault:
 				o.windowSize = 8 << 20
 			case SpeedBetterCompression:
-				o.windowSize = 16 << 20
+				o.windowSize = 8 << 20
 			case SpeedBestCompression:
-				o.windowSize = 32 << 20
+				o.windowSize = 8 << 20
 			}
 		}
 		if !o.customALEntropy {