diff --git a/docs/04_documents.md b/docs/04_documents.md
index b0ad88c5..82265df5 100644
--- a/docs/04_documents.md
+++ b/docs/04_documents.md
@@ -102,7 +102,6 @@ During stringification, a document with a true-ish `version` value will include
 | ------------------------------------------ | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | createNode(value, options?)           | `Node`     | Recursively wrap any input with appropriate `Node` containers. See [Creating Nodes](#creating-nodes) for more information.                                                                     |
 | createPair(key, value, options?) | `Pair`     | Recursively wrap `key` and `value` into a `Pair` object. See [Creating Nodes](#creating-nodes) for more information.                                                                           |
-| listNonDefaultTags()                       | `string[]` | List the tags used in the document that are not in the default `tag:yaml.org,2002:` namespace.                                                                                                 |
 | parse(cst)                                 | `Document` | Parse a CST into this document. Mostly an internal method, modifying the document according to the contents of the parsed `cst`. Calling this multiple times on a Document is not recommended. |
 | setSchema(id?, customTags?)                | `void`     | Set the schema used by the document. `id` may either be a YAML version, or the identifier of a YAML 1.2 schema; if set, `customTags` should have the same shape as the similarly-named option. |
 | setTagPrefix(handle, prefix)               | `void`     | Set `handle` as a shorthand string for the `prefix` tag namespace.                                                                                                                             |
diff --git a/index.d.ts b/index.d.ts
index 6b17369c..99f8cc3a 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -283,11 +283,7 @@ export class Document extends Collection {
    *   `Scalar` objects.
    */
   createPair(key: any, value: any, options?: { wrapScalars?: boolean }): Pair
-  /**
-   * List the tags used in the document that are not in the default
-   * `tag:yaml.org,2002:` namespace.
-   */
-  listNonDefaultTags(): string[]
+
   /** Parse a CST into this document */
   parse(cst: CST.Document): this
   /**
diff --git a/src/doc/Document.d.ts b/src/doc/Document.d.ts
index 7bf391eb..48dcb1fe 100644
--- a/src/doc/Document.d.ts
+++ b/src/doc/Document.d.ts
@@ -87,11 +87,7 @@ export class Document extends Collection {
    *   `Scalar` objects.
    */
   createPair(key: any, value: any, options?: { wrapScalars?: boolean }): Pair
-  /**
-   * List the tags used in the document that are not in the default
-   * `tag:yaml.org,2002:` namespace.
-   */
-  listNonDefaultTags(): string[]
+
   /** Parse a CST into this document */
   parse(cst: CST.Document): this
   /**
diff --git a/src/doc/Document.js b/src/doc/Document.js
index 52b088fa..433c5501 100644
--- a/src/doc/Document.js
+++ b/src/doc/Document.js
@@ -239,12 +239,6 @@ export class Document {
     return this
   }
 
-  listNonDefaultTags() {
-    return listTagNames(this.contents).filter(
-      t => t.indexOf(defaultTagPrefix) !== 0
-    )
-  }
-
   setTagPrefix(handle, prefix) {
     if (handle[0] !== '!' || handle[handle.length - 1] !== '!')
       throw new Error('Handle must start and end with !')
@@ -306,7 +300,9 @@ export class Document {
       lines.push(vd)
       hasDirectives = true
     }
-    const tagNames = this.listNonDefaultTags()
+    const tagNames = listTagNames(this.contents).filter(
+      t => t.indexOf(defaultTagPrefix) !== 0
+    )
     this.tagPrefixes.forEach(({ handle, prefix }) => {
       if (tagNames.some(t => t.indexOf(prefix) === 0)) {
         lines.push(`%TAG ${handle} ${prefix}`)