diff --git a/crates/tinymist-query/src/signature_help.rs b/crates/tinymist-query/src/signature_help.rs
index 733d82e0..566823ce 100644
--- a/crates/tinymist-query/src/signature_help.rs
+++ b/crates/tinymist-query/src/signature_help.rs
@@ -129,7 +129,7 @@ impl SemanticRequest for SignatureHelpRequest {
             ));
 
             params.push(LspParamInfo {
-                label: lsp_types::ParameterLabel::Simple(param.name.as_ref().into()),
+                label: lsp_types::ParameterLabel::Simple(format!("{}:", param.name)),
                 documentation: if !param.docs.is_empty() {
                     Some(Documentation::MarkupContent(MarkupContent {
                         value: param.docs.clone().into(),
diff --git a/tests/e2e/main.rs b/tests/e2e/main.rs
index f6cf611d..14915232 100644
--- a/tests/e2e/main.rs
+++ b/tests/e2e/main.rs
@@ -385,7 +385,7 @@ fn e2e() {
         });
 
         let hash = replay_log(&tinymist_binary, &root.join("vscode"));
-        insta::assert_snapshot!(hash, @"siphash128_13:232d10be45b5cb9d48abbfc5aab974be");
+        insta::assert_snapshot!(hash, @"siphash128_13:1e7e518ee933e10087b613f885945c41");
     }
 }