diff --git a/Lib/inspect.py b/Lib/inspect.py
index 857892bc814..3edf97d389e 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1070,8 +1070,10 @@ def getargspec(func):
     Alternatively, use getfullargspec() for an API with a similar namedtuple
     based interface, but full support for annotations and keyword-only
     parameters.
+
+    Deprecated since Python 3.5, use `inspect.getfullargspec()`.
     """
-    warnings.warn("inspect.getargspec() is deprecated, "
+    warnings.warn("inspect.getargspec() is deprecated since Python 3.0, "
                   "use inspect.signature() or inspect.getfullargspec()",
                   DeprecationWarning, stacklevel=2)
     args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults, ann = \
@@ -2797,19 +2799,25 @@ class Signature:
 
     @classmethod
     def from_function(cls, func):
-        """Constructs Signature for the given python function."""
+        """Constructs Signature for the given python function.
 
-        warnings.warn("inspect.Signature.from_function() is deprecated, "
-                      "use Signature.from_callable()",
+        Deprecated since Python 3.5, use `Signature.from_callable()`.
+        """
+
+        warnings.warn("inspect.Signature.from_function() is deprecated since "
+                      "Python 3.5, use Signature.from_callable()",
                       DeprecationWarning, stacklevel=2)
         return _signature_from_function(cls, func)
 
     @classmethod
     def from_builtin(cls, func):
-        """Constructs Signature for the given builtin function."""
+        """Constructs Signature for the given builtin function.
 
-        warnings.warn("inspect.Signature.from_builtin() is deprecated, "
-                      "use Signature.from_callable()",
+        Deprecated since Python 3.5, use `Signature.from_callable()`.
+        """
+
+        warnings.warn("inspect.Signature.from_builtin() is deprecated since "
+                      "Python 3.5, use Signature.from_callable()",
                       DeprecationWarning, stacklevel=2)
         return _signature_from_builtin(cls, func)
 
diff --git a/Misc/NEWS.d/next/Documentation/2018-05-21-14-36-12.bpo-33594.-HRcyX.rst b/Misc/NEWS.d/next/Documentation/2018-05-21-14-36-12.bpo-33594.-HRcyX.rst
new file mode 100644
index 00000000000..a63c4a5004c
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2018-05-21-14-36-12.bpo-33594.-HRcyX.rst
@@ -0,0 +1,3 @@
+Document ``getargspec``, ``from_function`` and ``from_builtin`` as
+deprecated in their respective docstring, and include version since
+deprecation in DeprecationWarning message.