diff --git a/command/validate.go b/command/validate.go
index 718fcc121..657d71ebc 100644
--- a/command/validate.go
+++ b/command/validate.go
@@ -108,6 +108,7 @@ Options:
   -var 'key=value'              Variable for templates, can be used multiple times.
   -var-file=path                JSON or HCL2 file containing user variables, can be used multiple times.
   -no-warn-undeclared-var       Disable warnings for user variable files containing undeclared variables.
+  -evaluate-datasources         Evaluate data sources during validation (HCL2 only, may incur costs); Defaults to false. 
 `
 
 	return strings.TrimSpace(helpText)