diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json
index e00edeb66435..4f22a8b8cf95 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json
@@ -34,8 +34,8 @@
         }
       }
     },
-    "Container": {
-      "description": "Container App container definition.",
+    "BaseContainer": {
+      "description": "Container App base container definition.",
       "type": "object",
       "properties": {
         "image": {
@@ -74,24 +74,44 @@
           "$ref": "#/definitions/ContainerResources",
           "description": "Container resource requirements."
         },
-        "probes": {
-          "description": "List of probes for the container.",
+        "volumeMounts": {
+          "description": "Container volume mounts.",
           "type": "array",
           "items": {
-            "$ref": "#/definitions/ContainerAppProbe"
+            "$ref": "#/definitions/VolumeMount"
           },
           "x-ms-identifiers": [
-            "type"
+            "volumeName"
           ]
-        },
-        "volumeMounts": {
-          "description": "Container volume mounts.",
+        }
+      }
+    },
+    "InitContainer": {
+      "description": "Container App init container definition",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/BaseContainer"
+        }
+      ]
+    },
+    "Container": {
+      "description": "Container App container definition",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/BaseContainer"
+        }
+      ],
+      "properties": {
+        "probes": {
+          "description": "List of probes for the container.",
           "type": "array",
           "items": {
-            "$ref": "#/definitions/VolumeMount"
+            "$ref": "#/definitions/ContainerAppProbe"
           },
           "x-ms-identifiers": [
-            "volumeName"
+            "type"
           ]
         }
       }
@@ -468,6 +488,16 @@
           "description": "User friendly suffix that is appended to the revision name",
           "type": "string"
         },
+        "initContainers": {
+          "description": "List of specialized containers that run before app containers.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/InitContainer"
+          },
+          "x-ms-identifiers": [
+            "name"
+          ]
+        },
         "containers": {
           "description": "List of container definitions for the Container App.",
           "type": "array",
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_CreateOrUpdate.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_CreateOrUpdate.json
index 538658bd88b5..24c0e5f580bd 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_CreateOrUpdate.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_CreateOrUpdate.json
@@ -63,6 +63,23 @@
               ]
             }
           ],
+          "initContainers": [
+            {
+              "image": "repo/testcontainerApp0:v4",
+              "name": "testinitcontainerApp0",
+              "resources": {
+                "cpu": 0.2,
+                "memory": "100Mi"
+              },
+              "command": [
+                "/bin/sh"
+              ],
+              "args": [
+                "-c",
+                "while true; do echo hello; sleep 10;done"
+              ]
+            }
+          ],
           "scale": {
             "minReplicas": 1,
             "maxReplicas": 5,
@@ -159,6 +176,23 @@
                 ]
               }
             ],
+            "initContainers": [
+              {
+                "image": "repo/testcontainerApp0:v4",
+                "name": "testinitcontainerApp0",
+                "resources": {
+                  "cpu": 0.2,
+                  "memory": "100Mi"
+                },
+                "command": [
+                  "/bin/sh"
+                ],
+                "args": [
+                  "-c",
+                  "while true; do echo hello; sleep 10;done"
+                ]
+              }
+            ],
             "scale": {
               "minReplicas": 1,
               "maxReplicas": 5,
@@ -241,6 +275,23 @@
                 ]
               }
             ],
+            "initContainers": [
+              {
+                "image": "repo/testcontainerApp0:v4",
+                "name": "testinitcontainerApp0",
+                "resources": {
+                  "cpu": 0.2,
+                  "memory": "100Mi"
+                },
+                "command": [
+                  "/bin/sh"
+                ],
+                "args": [
+                  "-c",
+                  "while true; do echo hello; sleep 10;done"
+                ]
+              }
+            ],
             "scale": {
               "minReplicas": 1,
               "maxReplicas": 5,
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Get.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Get.json
index d48160502b2f..82fda18754ed 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Get.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Get.json
@@ -65,6 +65,16 @@
                 }
               }
             ],
+            "initContainers": [
+              {
+                "image": "repo/testcontainerApp0:v4",
+                "name": "testinitcontainerApp0",
+                "resources": {
+                  "cpu": 0.2,
+                  "memory": "100Mi"
+                }
+              }
+            ],
             "scale": {
               "minReplicas": 1,
               "maxReplicas": 5,
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListByResourceGroup.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListByResourceGroup.json
index 93204d1cf0f0..c6764d48d46f 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListByResourceGroup.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListByResourceGroup.json
@@ -66,6 +66,16 @@
                     }
                   }
                 ],
+                "initContainers": [
+                  {
+                    "image": "repo/testcontainerApp0:v4",
+                    "name": "testinitcontainerApp0",
+                    "resources": {
+                      "cpu": 0.2,
+                      "memory": "100Mi"
+                    }
+                  }
+                ],
                 "scale": {
                   "minReplicas": 1,
                   "maxReplicas": 5,
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListBySubscription.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListBySubscription.json
index 7a5d0252899b..ce61a6600e5c 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListBySubscription.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_ListBySubscription.json
@@ -65,6 +65,16 @@
                     }
                   }
                 ],
+                "initContainers": [
+                  {
+                    "image": "repo/testcontainerApp0:v4",
+                    "name": "testinitcontainerApp0",
+                    "resources": {
+                      "cpu": 0.2,
+                      "memory": "100Mi"
+                    }
+                  }
+                ],
                 "scale": {
                   "minReplicas": 1,
                   "maxReplicas": 5,
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Patch.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Patch.json
index b7e19ec6d042..1d789a686ec2 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Patch.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/examples/ContainerApps_Patch.json
@@ -66,6 +66,16 @@
               ]
             }
           ],
+          "initContainers": [
+            {
+              "image": "repo/testcontainerApp0:v4",
+              "name": "testinitcontainerApp0",
+              "resources": {
+                "cpu": 0.2,
+                "memory": "100Mi"
+              }
+            }
+          ],
           "scale": {
             "minReplicas": 1,
             "maxReplicas": 5,