diff --git a/src/external-types/markdown-it-ins/index.d.ts b/src/external-types/markdown-it-ins/index.d.ts
new file mode 100644
index 000000000..ee134cf6d
--- /dev/null
+++ b/src/external-types/markdown-it-ins/index.d.ts
@@ -0,0 +1,6 @@
+
+declare module 'markdown-it-ins' {
+  import MarkdownIt from 'markdown-it/lib'
+  const markdownItInserted: MarkdownIt.PluginSimple
+  export = markdownItInserted
+}
diff --git a/src/external-types/markdown-it-mark/index.d.ts b/src/external-types/markdown-it-mark/index.d.ts
new file mode 100644
index 000000000..13cdceb0d
--- /dev/null
+++ b/src/external-types/markdown-it-mark/index.d.ts
@@ -0,0 +1,6 @@
+
+declare module 'markdown-it-mark' {
+  import MarkdownIt from 'markdown-it/lib'
+  const markdownItMark: MarkdownIt.PluginSimple
+  export = markdownItMark
+}
diff --git a/src/external-types/markdown-it-sub/index.d.ts b/src/external-types/markdown-it-sub/index.d.ts
new file mode 100644
index 000000000..b5af9f5d4
--- /dev/null
+++ b/src/external-types/markdown-it-sub/index.d.ts
@@ -0,0 +1,6 @@
+
+declare module 'markdown-it-sub' {
+  import MarkdownIt from 'markdown-it/lib'
+  const markdownItSubscript: MarkdownIt.PluginSimple
+  export = markdownItSubscript
+}
diff --git a/src/external-types/markdown-it-sup/index.d.ts b/src/external-types/markdown-it-sup/index.d.ts
new file mode 100644
index 000000000..85eb51ace
--- /dev/null
+++ b/src/external-types/markdown-it-sup/index.d.ts
@@ -0,0 +1,6 @@
+
+declare module 'markdown-it-sup' {
+  import MarkdownIt from 'markdown-it/lib'
+  const markdownItSuperscript: MarkdownIt.PluginSimple
+  export = markdownItSuperscript
+}