diff --git a/versions/1.2.md b/versions/1.2.md
index 814e34dfad..d2e7788cdd 100644
--- a/versions/1.2.md
+++ b/versions/1.2.md
@@ -838,6 +838,8 @@ The Parameter Object describes a single parameter to be sent in an operation and
 
 This object includes the [Data Type Fields](#433-data-type-fields) in order to describe the type of this parameter. The [`type`](#dataTypeType) field MUST be used to link to other models.
 
+If [`$ref`](#dataTypeRef) is used or [`type`](#dataTypeType) is a model's [`id`](#modelId), the [`paramType`](#parameterParamType) field MUST be `"body"` or `"form"`.
+
 If [`type`](#dataTypeType) is [`File`](#434-file), the [`consumes`](#operationConsumes) field MUST be `"multipart/form-data"`, and the [`paramType`](#parameterParamType) MUST be `"form"`.
 
 Field Name | Type | Description