diff --git a/jedi_vim.py b/jedi_vim.py
index 40e1f97..ee085da 100644
--- a/jedi_vim.py
+++ b/jedi_vim.py
@@ -450,10 +450,12 @@ def cmdline_call_signatures(signatures):
         max_msg_len -= 18
     max_msg_len -= len(signatures[0].call_name) + 2  # call name + parentheses
 
-    if max_msg_len < 0:
+    if max_msg_len < (1 if params else 0):
         return
     elif index is None:
-        pass
+        text = escape(', '.join(params))
+        if params and len(text) > max_msg_len:
+            text = ELLIPSIS
     elif max_msg_len < len(ELLIPSIS):
         return
     else:
@@ -498,8 +500,8 @@ def cmdline_call_signatures(signatures):
     else:
         vim_command('                      echon "%s" | '
                     'echohl Function     | echon "%s" | '
-                    'echohl None         | echon "()"'
-                    % (spaces, signatures[0].call_name))
+                    'echohl None         | echon "(%s)"'
+                    % (spaces, signatures[0].call_name, text))
 
 
 @_check_jedi_availability(show_error=True)
diff --git a/test/signatures.vim b/test/signatures.vim
index 5571876..c1525f6 100644
--- a/test/signatures.vim
+++ b/test/signatures.vim
@@ -75,6 +75,13 @@ describe 'signatures'
         doautocmd InsertLeave 
         redir END
         Expect msg == "\n"
+
+        normal Sdef foo(a, b): pass
+        normal ofoo(a, b, c, 
+        redir => msg
+        Python jedi_vim.show_call_signatures()
+        redir END
+        Expect msg == "\nfoo(a, b)"
     end
 
     it 'command line truncation'