diff --git a/command/build/help.go b/command/build/help.go
index 8cd97c14e..d6b219914 100644
--- a/command/build/help.go
+++ b/command/build/help.go
@@ -13,4 +13,5 @@ Options:
   -except=foo,bar,baz        Build all builds other than these
   -only=foo,bar,baz          Only build the given builds by name
   -var 'key=value'           Variable for templates, can be used multiple times.
+  -var-file=path         JSON file containing user variables.
 `
diff --git a/command/validate/help.go b/command/validate/help.go
index 2289fa68c..8959cd881 100644
--- a/command/validate/help.go
+++ b/command/validate/help.go
@@ -15,5 +15,6 @@ Options:
   -syntax-only           Only check syntax. Do not verify config of the template.
   -except=foo,bar,baz    Validate all builds other than these
   -only=foo,bar,baz      Validate only these builds
-  -var 'key=value'           Variable for templates, can be used multiple times.
+  -var 'key=value'       Variable for templates, can be used multiple times.
+  -var-file=path         JSON file containing user variables.
 `