diff --git a/docsig/_signature.py b/docsig/_signature.py
index f64f52b8..25175e4a 100644
--- a/docsig/_signature.py
+++ b/docsig/_signature.py
@@ -16,6 +16,10 @@ class Signature:
 
     :param arguments: Argument's abstract syntax tree.
     :param returns: Function's return value.
+    :param ismethod: Boolean value for whether this signature is for a
+        class method or not.
+    :param isstaticmethod: Boolean value for whether this signature is
+        for a static method or not.
     """
 
     _param = "param"