diff --git a/pybindgen/cppclass.py b/pybindgen/cppclass.py
index 10bfc46..1971151 100644
--- a/pybindgen/cppclass.py
+++ b/pybindgen/cppclass.py
@@ -2205,6 +2205,10 @@ typedef struct {
         if self.binary_numeric_operators:
             tp_flags.add("Py_TPFLAGS_CHECKTYPES")            
         self.slots.setdefault("tp_flags", '|'.join(tp_flags))
+
+        if docstring is None:
+            docstring = self.generate_docstring()
+
         self.slots.setdefault("tp_doc", (docstring is None and 'NULL'
                                          or "\"%s\"" % (docstring,)))
         dict_ = self.slots
@@ -2227,6 +2231,10 @@ typedef struct {
 
         self.pytype.generate(code_sink)
 
+    def generate_docstring(self):
+        name = self.get_python_name()
+        return "\\n".join(sorted([c.generate_docstring(name) for c in self.constructors],
+                                 key=len, reverse=True))
 
     def _generate_constructor(self, code_sink):
         """generate the constructor, if any"""
diff --git a/pybindgen/cppmethod.py b/pybindgen/cppmethod.py
index c5b31bd..9d29e2f 100644
--- a/pybindgen/cppmethod.py
+++ b/pybindgen/cppmethod.py
@@ -406,12 +406,23 @@ class CppMethod(ForwardWrapperBase):
     def get_py_method_def(self, method_name):
         "Get the PyMethodDef entry suitable for this method"
         flags = self.get_py_method_def_flags()
+
+        if self.docstring is None:
+            self.docstring = self.generate_docstring(method_name)
+
         return "{(char *) \"%s\", (PyCFunction) %s, %s, %s }," % \
                (method_name, self.wrapper_actual_name, '|'.join(flags),
                 (self.docstring is None and "NULL" or ('"'+self.docstring+'"')))
 
+    def generate_docstring(self, name):
+        parameters = self.parameters
+        signature = "{0}({1})".format(name, ", ".join([p.name for p in parameters]))
+        params = "\\n".join(["type: {0}: {1}".format(p.name, p.ctype)
+                             for p in parameters])
+        string = signature + "\\n\\n" + params
+        return string
+
     def __str__(self):
-        
         if self.class_ is None:
             cls_name = "???"
         else:
@@ -736,6 +747,9 @@ class CppConstructor(ForwardWrapperBase):
         code_sink.writeln('return 0;')
         self.write_close_wrapper(code_sink)
 
+    def generate_docstring(self, name):
+        return "{0}({1})".format(name, ', '.join([p.name for p in self.parameters]))
+
     def __str__(self):
         if not hasattr(self, '_class'):
             return object.__str__(self)
diff --git a/pybindgen/function.py b/pybindgen/function.py
index 77d7940..19b0883 100644
--- a/pybindgen/function.py
+++ b/pybindgen/function.py
@@ -289,10 +289,22 @@ class Function(ForwardWrapperBase):
         assert isinstance(self.wrapper_return, string_types)
         assert isinstance(self.wrapper_actual_name, string_types)
         assert isinstance(self.wrapper_args, list)
+
+        if self.docstring is None:
+            self.docstring = self.generate_docstring(name)
+
         return "{(char *) \"%s\", (PyCFunction) %s, %s, %s }," % \
                (name, self.wrapper_actual_name, '|'.join(flags),
                 (self.docstring is None and "NULL" or ('"'+self.docstring+'"')))
 
+    def generate_docstring(self, name):
+        parameters = self.parameters
+        signature = "{0}({1})".format(name, ", ".join([p.name for p in parameters]))
+        params = "\\n".join(["type: {0}: {1}".format(p.name, p.ctype)
+                             for p in parameters])
+        string = signature + "\\n\\n" + params
+        return string
+
 
 class CustomFunctionWrapper(Function):
     """