diff --git a/crates/tabby/src/serve/completions/prompt.rs b/crates/tabby/src/serve/completions/prompt.rs
index 6c827c5..b5bf4a0 100644
--- a/crates/tabby/src/serve/completions/prompt.rs
+++ b/crates/tabby/src/serve/completions/prompt.rs
@@ -197,8 +197,14 @@ impl IndexState {
 }
 
 lazy_static! {
-    static ref LANGUAGE_LINE_COMMENT_CHAR: HashMap<&'static str, &'static str> =
-        HashMap::from([("python", "#"), ("rust", "//"),]);
+    static ref LANGUAGE_LINE_COMMENT_CHAR: HashMap<&'static str, &'static str> = HashMap::from([
+        ("python", "#"),
+        ("rust", "//"),
+        ("javascript-typescript", "//"),
+        ("go", "//"),
+        ("java", "//"),
+        ("lua", "--"),
+    ]);
 }
 
 #[cfg(test)]