diff --git a/post-rs/src/main.rs b/post-rs/src/main.rs
index cf2b20a..eed8ee9 100644
--- a/post-rs/src/main.rs
+++ b/post-rs/src/main.rs
@@ -116,7 +116,11 @@ fn main() {
 
 fn get_content_type(file_name: &str) -> String {
     let file_name = file_name.to_ascii_lowercase();
-    if file_name.ends_with(".txt") {
+    if file_name.ends_with(".txt")
+        || file_name.ends_with(".text")
+        || file_name.ends_with(".diff")
+        || file_name.ends_with(".md")
+        || file_name.ends_with(".markdown") {
         "text/plain".into()
     } else if file_name.ends_with(".aac") {
         "audio/aac".into()