diff --git a/specification.md b/specification.md
index 959eac3..269e1a7 100644
--- a/specification.md
+++ b/specification.md
@@ -305,7 +305,7 @@ The log level can be set with the environment variable `MCC_LOG_LEVEL`.
     1 = normal logging (info)
     2 = verbose logging (debug)
 
-The output destination can be set with `MCC_LOG_FILE` and defaults to `stdout`.
+The output destination can be set with `MCC_LOG_FILE` and defaults to `stderr`.
 
 Log messages do not overlap on multi-threaded execution.