diff --git a/articles/gopher.md b/articles/gopher.md
index dfbe822..f8fec08 100644
--- a/articles/gopher.md
+++ b/articles/gopher.md
@@ -46,6 +46,18 @@ The type field can be any of the following:
 | g    | GIF image                                           |
 | I    | Image, file format unspecified.                     |
 
+And some common extension types:
+| Type | Description                                         |
+| :--: |-----------------------------------------------------|
+| d    | .doc file                                           |
+| h    | HTML document                                       |
+| i    | Informational message                               |
+| p    | PNG image                                           |
+| r    | RTF document                                        |
+| s    | Sound file, usually .wav                            |
+| P    | PDF document                                        |
+| X    | XML document                                        |
+
 A relative link to a document in the same server:
 ```
 1About	/about	khzae.net	70