diff --git a/docs/data/docs.json b/docs/data/docs.json
index de158a7f8..4a68378ae 100644
--- a/docs/data/docs.json
+++ b/docs/data/docs.json
@@ -1519,7 +1519,7 @@
         "isHTML": true,
         "noUgly": false,
         "notAlternative": false,
-        "Permalinkable": true
+        "permalinkable": true
       },
       {
         "MediaType": "text/css",
@@ -1542,7 +1542,7 @@
         "isHTML": false,
         "noUgly": false,
         "notAlternative": true,
-        "Permalinkable": false
+        "permalinkable": false
       },
       {
         "MediaType": "text/csv",
@@ -1565,7 +1565,7 @@
         "isHTML": false,
         "noUgly": false,
         "notAlternative": false,
-        "Permalinkable": false
+        "permalinkable": false
       },
       {
         "MediaType": "text/calendar",
@@ -1588,7 +1588,7 @@
         "isHTML": false,
         "noUgly": false,
         "notAlternative": false,
-        "Permalinkable": false
+        "permalinkable": false
       },
       {
         "MediaType": "text/html",
@@ -1611,7 +1611,7 @@
         "isHTML": true,
         "noUgly": false,
         "notAlternative": false,
-        "Permalinkable": true
+        "permalinkable": true
       },
       {
         "MediaType": "application/json",
@@ -1634,7 +1634,7 @@
         "isHTML": false,
         "noUgly": false,
         "notAlternative": false,
-        "Permalinkable": false
+        "permalinkable": false
       },
       {
         "MediaType": "text/plain",
@@ -1657,7 +1657,7 @@
         "isHTML": false,
         "noUgly": false,
         "notAlternative": false,
-        "Permalinkable": false
+        "permalinkable": false
       },
       {
         "MediaType": "application/rss+xml",
@@ -1680,7 +1680,7 @@
         "isHTML": false,
         "noUgly": true,
         "notAlternative": false,
-        "Permalinkable": false
+        "permalinkable": false
       },
       {
         "MediaType": "application/xml",
@@ -1703,7 +1703,7 @@
         "isHTML": false,
         "noUgly": true,
         "notAlternative": false,
-        "Permalinkable": false
+        "permalinkable": false
       }
     ],
     "layouts": [
diff --git a/output/outputFormat.go b/output/outputFormat.go
index 5a794e340..9f371f856 100644
--- a/output/outputFormat.go
+++ b/output/outputFormat.go
@@ -77,7 +77,7 @@ type Format struct {
 	// as you probably don't want to link back to the RSS version of a page, as an
 	// example. AMP would, however, be a good example of an output format where this
 	// behaviour is wanted.
-	Permalinkable bool
+	Permalinkable bool `json:"permalinkable"`
 }
 
 // An ordered list of built-in output formats.