diff --git a/docs/sphinx_pyodide/sphinx_pyodide/jsdoc.py b/docs/sphinx_pyodide/sphinx_pyodide/jsdoc.py
index aaf0cb91a..b03152608 100644
--- a/docs/sphinx_pyodide/sphinx_pyodide/jsdoc.py
+++ b/docs/sphinx_pyodide/sphinx_pyodide/jsdoc.py
@@ -229,10 +229,15 @@ class JSFuncMaybeAsync(JSCallable):
         "async": directives.flag,
     }
 
-    def handle_signature(self, sig, signode):
+    def get_display_prefix(
+        self,
+    ):
         if "async" in self.options:
-            self.display_prefix = "async"
-        return super().handle_signature(sig, signode)
+            return [
+                addnodes.desc_sig_keyword("async", "async"),
+                addnodes.desc_sig_space(),
+            ]
+        return []
 
 
 JavaScriptDomain.directives["function"] = JSFuncMaybeAsync
@@ -489,14 +494,14 @@ def get_jsdoc_summary_directive(app):
             """
             sig = self.get_sig(obj)
             display_name = obj.name
-            prefix = "*async* " if obj.async_ else ""
+            prefix = "**async** " if obj.async_ else ""
             summary = self.extract_summary(obj.description)
             link_name = pkgname + "." + display_name
             return (prefix, display_name, sig, summary, link_name)
 
         def get_summary_table(self, pkgname, group):
-            """Get the data for a summary table. Return value is set up to be an
-            argument of format_table.
+            """Get the data for a summary tget_summary_tableable. Return value
+            is set up to be an argument of format_table.
             """
             return [self.get_summary_row(pkgname, obj) for obj in group]
 
@@ -542,15 +547,13 @@ def get_jsdoc_summary_directive(app):
                 body.append(row)
 
             for prefix, name, sig, summary, real_name in items:
-                qualifier = "any"  # <== Only thing changed from autosummary version
+                # The body of this loop is changed from copied code.
+                qualifier = "any"
+                sig = rst.escape(sig)
+                if sig:
+                    sig = f"**{sig}**"
                 if "nosignatures" not in self.options:
-                    col1 = "{}:{}:`{} <{}>`\\ {}".format(
-                        prefix,
-                        qualifier,
-                        name,
-                        real_name,
-                        rst.escape(sig),
-                    )
+                    col1 = f"{prefix}:{qualifier}:`{name} <{real_name}>`\\ {sig}"
                 else:
                     col1 = f"{prefix}:{qualifier}:`{name} <{real_name}>`"
                 col2 = summary
diff --git a/docs/sphinx_pyodide/tests/test_directives.py b/docs/sphinx_pyodide/tests/test_directives.py
index 7b5a535d7..aec678966 100644
--- a/docs/sphinx_pyodide/tests/test_directives.py
+++ b/docs/sphinx_pyodide/tests/test_directives.py
@@ -167,7 +167,7 @@ def test_summary():
     attributes = {t[1]: t for t in attributes}
     functions = {t[1]: t for t in functions}
     assert globals["loadPyodide"] == (
-        "*async* ",
+        "**async** ",
         "loadPyodide",
         "(config)",
         "Load the main Pyodide wasm module and initialize it.",
@@ -197,7 +197,7 @@ def test_summary():
     )
 
     assert functions["loadPackagesFromImports"][:-2] == (
-        "*async* ",
+        "**async** ",
         "loadPackagesFromImports",
         "(code, messageCallback, errorCallback)",
     )
diff --git a/src/core/pyproxy.ts b/src/core/pyproxy.ts
index 94f794505..3a638756b 100644
--- a/src/core/pyproxy.ts
+++ b/src/core/pyproxy.ts
@@ -453,6 +453,9 @@ export class PyProxyClass {
     throw new TypeError("PyProxy is not a constructor");
   }
 
+  /**
+   * @private
+   */
   get [Symbol.toStringTag]() {
     return "PyProxy";
   }