diff --git a/build.yml b/build.yml
index a1b9d57..437b1a7 100644
--- a/build.yml
+++ b/build.yml
@@ -15,7 +15,7 @@ targets:
     doc: Run an integration test
     depends: bin
     steps:
-    # test without -file option
+    # test without -env option
     - write: '={BUILD_DIR}/test'
       text:  "#!/bin/sh\necho $FOO\necho $SPAM"
     - chmod: '={BUILD_DIR}/test'
@@ -26,7 +26,7 @@ targets:
     - if: 'output != "BAR\nEGGS"'
       then:
       - throw: "Test failed:\n={output}"
-    # test with -file option
+    # test with -env option
     - $:  ['={BUILD_DIR}/dotrun', '-env', '.env2', '={BUILD_DIR}/test']
       1=: output
       1x: true
diff --git a/dotrun.go b/dotrun.go
index 5821b64..222a8ac 100644
--- a/dotrun.go
+++ b/dotrun.go
@@ -13,7 +13,7 @@ import (
 )
 
 const (
-	help = `Usage: dotrun [-file .env] command args...
+	help = `Usage: dotrun [-env .env] command args...
 -env file   Alternative dotenv file
 command     The command to run
 args        The command arguments`