diff --git a/lib/Logger/LoggerFeature.cpp b/lib/Logger/LoggerFeature.cpp
index 1f8e5ed4d6..079366b928 100644
--- a/lib/Logger/LoggerFeature.cpp
+++ b/lib/Logger/LoggerFeature.cpp
@@ -99,7 +99,9 @@ void LoggerFeature::collectOptions(std::shared_ptr<ProgramOptions> options) {
   options->addOption("--log.escape", "escape characters when logging",
                      new BooleanParameter(&_useEscaped));
 
-  options->addOption("--log.output,-o", "log destination(s)",
+  options->addOption("--log.output,-o",
+                     "log destination(s), e.g. file:///path/to/file (Linux, macOS) "
+                     "or file://C:\\path\\to\\file (Windows)",
                      new VectorParameter<StringParameter>(&_output));
 
   options->addOption("--log.level,-l", "the global or topic-specific log level",