diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 679a596821f..9a22e56686f 100644
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -951,6 +951,12 @@ class HTMLDoc(Doc):
                 else:
                     note = ' unbound %s method' % self.classlink(imclass,mod)
 
+        if (inspect.iscoroutinefunction(object) or
+                inspect.isasyncgenfunction(object)):
+            asyncqualifier = 'async '
+        else:
+            asyncqualifier = ''
+
         if name == realname:
             title = '<a name="%s"><strong>%s</strong></a>' % (anchor, realname)
         else:
@@ -979,8 +985,8 @@ class HTMLDoc(Doc):
         if not argspec:
             argspec = '(...)'
 
-        decl = title + self.escape(argspec) + (note and self.grey(
-               '<font face="helvetica, arial">%s</font>' % note))
+        decl = asyncqualifier + title + self.escape(argspec) + (note and
+               self.grey('<font face="helvetica, arial">%s</font>' % note))
 
         if skipdocs:
             return '<dl><dt>%s</dt></dl>\n' % decl
@@ -1382,6 +1388,12 @@ location listed above.
                 else:
                     note = ' unbound %s method' % classname(imclass,mod)
 
+        if (inspect.iscoroutinefunction(object) or
+                inspect.isasyncgenfunction(object)):
+            asyncqualifier = 'async '
+        else:
+            asyncqualifier = ''
+
         if name == realname:
             title = self.bold(realname)
         else:
@@ -1405,7 +1417,7 @@ location listed above.
                     argspec = argspec[1:-1] # remove parentheses
         if not argspec:
             argspec = '(...)'
-        decl = title + argspec + note
+        decl = asyncqualifier + title + argspec + note
 
         if skipdocs:
             return decl + '\n'
diff --git a/Lib/test/test_pydoc.py b/Lib/test/test_pydoc.py
index 67c6c5d42d4..6efdeb047c2 100644
--- a/Lib/test/test_pydoc.py
+++ b/Lib/test/test_pydoc.py
@@ -1288,6 +1288,29 @@ foo
     Custom descriptor
 """)
 
+    def test_async_annotation(self):
+        async def coro_function(ign) -> int:
+            return 1
+
+        text = pydoc.plain(pydoc.plaintext.document(coro_function))
+        self.assertIn('async coro_function', text)
+
+        html = pydoc.HTMLDoc().document(coro_function)
+        self.assertIn(
+            'async <a name="-coro_function"><strong>coro_function',
+            html)
+
+    def test_async_generator_annotation(self):
+        async def an_async_generator():
+            yield 1
+
+        text = pydoc.plain(pydoc.plaintext.document(an_async_generator))
+        self.assertIn('async an_async_generator', text)
+
+        html = pydoc.HTMLDoc().document(an_async_generator)
+        self.assertIn(
+            'async <a name="-an_async_generator"><strong>an_async_generator',
+            html)
 
 class PydocServerTest(unittest.TestCase):
     """Tests for pydoc._start_server"""
diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-02-24-12-44-46.bpo-36045.RO20OV.rst b/Misc/NEWS.d/next/Core and Builtins/2019-02-24-12-44-46.bpo-36045.RO20OV.rst
new file mode 100644
index 00000000000..7cab3ea8409
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2019-02-24-12-44-46.bpo-36045.RO20OV.rst	
@@ -0,0 +1 @@
+builtins.help() now prefixes `async` for async functions