diff --git a/src/runtime/debug.go b/src/runtime/debug.go
index 76eeb2e41a..f411b22676 100644
--- a/src/runtime/debug.go
+++ b/src/runtime/debug.go
@@ -10,9 +10,8 @@ import (
 )
 
 // GOMAXPROCS sets the maximum number of CPUs that can be executing
-// simultaneously and returns the previous setting. If n < 1, it does not
-// change the current setting.
-// The number of logical CPUs on the local machine can be queried with NumCPU.
+// simultaneously and returns the previous setting. It defaults to
+// the value of runtime.NumCPU. If n < 1, it does not change the current setting.
 // This call will go away when the scheduler improves.
 func GOMAXPROCS(n int) int {
 	if GOARCH == "wasm" && n > 1 {