diff --git a/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/Notebook.json b/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/Notebook.json
index 955392b60359..37819ab50071 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/Notebook.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/Notebook.json
@@ -46,6 +46,7 @@
         "folder": {
           "description": "The folder that this notebook is in. If not specified, this notebook will appear at the root level.",
           "type": "object",
+          "x-nullable": true,
           "properties": {
             "name": {
               "description": "The name of the folder that this notebook is in.",
diff --git a/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SparkJobDefinition.json b/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SparkJobDefinition.json
index a3d67ba9b4e8..31b2ef7f4040 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SparkJobDefinition.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SparkJobDefinition.json
@@ -33,6 +33,7 @@
         "folder": {
           "description": "The folder that this Spark job definition is in. If not specified, this Spark job definition will appear at the root level.",
           "type": "object",
+          "x-nullable": true,
           "properties": {
             "name": {
               "description": "The name of the folder that this Spark job definition is in.",
diff --git a/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SqlScript.json b/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SqlScript.json
index bee2e7b5f972..3d41e9c10b34 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SqlScript.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/SqlScript.json
@@ -32,6 +32,7 @@
         "folder": {
           "description": "The folder that this SQL script is in. If not specified, this SQL script will appear at the root level.",
           "type": "object",
+          "x-nullable": true,
           "properties": {
             "name": {
               "description": "The name of the folder that this SQL script is in.",
diff --git a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/Notebook.json b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/Notebook.json
index 6eadbdfb265e..a7c665a1fcb3 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/Notebook.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/Notebook.json
@@ -46,6 +46,7 @@
         "folder": {
           "description": "The folder that this notebook is in. If not specified, this notebook will appear at the root level.",
           "type": "object",
+          "x-nullable": true,
           "properties": {
             "name": {
               "description": "The name of the folder that this notebook is in.",
diff --git a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SparkJobDefinition.json b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SparkJobDefinition.json
index 94c4655cc091..dfe09affe0ba 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SparkJobDefinition.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SparkJobDefinition.json
@@ -33,6 +33,7 @@
         "folder": {
           "description": "The folder that this Spark job definition is in. If not specified, this Spark job definition will appear at the root level.",
           "type": "object",
+          "x-nullable": true,
           "properties": {
             "name": {
               "description": "The name of the folder that this Spark job definition is in.",
diff --git a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SqlScript.json b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SqlScript.json
index 52e67798ef61..cb66102c02f5 100644
--- a/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SqlScript.json
+++ b/specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/SqlScript.json
@@ -32,6 +32,7 @@
         "folder": {
           "description": "The folder that this SQL script is in. If not specified, this SQL script will appear at the root level.",
           "type": "object",
+          "x-nullable": true,
           "properties": {
             "name": {
               "description": "The name of the folder that this SQL script is in.",