diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2017-04-24-preview/billing.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2017-04-24-preview/billing.json
index 47726b6c1721..1c492d43ed9a 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2017-04-24-preview/billing.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2017-04-24-preview/billing.json
@@ -486,7 +486,7 @@
           "readOnly": true
         },
         "billingPeriodIds": {
-          "description": "Array of billing perdiod ids that the invoice is attributed to.",
+          "description": "Array of billing period ids that the invoice is attributed to.",
           "type": "array",
           "readOnly": true,
           "items": {
@@ -582,4 +582,4 @@
       "type": "string"
     }
   }
-}
+}
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2018-03-01-preview/billing.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2018-03-01-preview/billing.json
index c64db9ceb132..74de6d615fa9 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2018-03-01-preview/billing.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2018-03-01-preview/billing.json
@@ -590,7 +590,7 @@
           "readOnly": true
         },
         "billingPeriodIds": {
-          "description": "Array of billing perdiod ids that the invoice is attributed to.",
+          "description": "Array of billing period ids that the invoice is attributed to.",
           "type": "array",
           "readOnly": true,
           "items": {
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2018-08-01-preview/billing.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2018-08-01-preview/billing.json
index 069933f95a46..494e02ab35e3 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2018-08-01-preview/billing.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2018-08-01-preview/billing.json
@@ -877,7 +877,7 @@
           "readOnly": true
         },
         "billingPeriodIds": {
-          "description": "Array of billing perdiod ids that the invoice is attributed to.",
+          "description": "Array of billing period ids that the invoice is attributed to.",
           "type": "array",
           "readOnly": true,
           "items": {
@@ -1010,7 +1010,7 @@
       "description": "Details of the product to be transferred.",
       "properties": {
         "productType": {
-          "description": "Type of the prouct to be transferred.",
+          "description": "Type of the product to be transferred.",
           "$ref": "#/definitions/ProductType"
         },
         "productId": {
@@ -1126,7 +1126,7 @@
         },
         "invoiceSectionId": {
           "type": "string",
-          "description": "Target invoice setion Id.",
+          "description": "Target invoice section Id.",
           "readOnly": true
         },
         "billingAccountId": {