diff --git a/Doc/c-api/veryhigh.rst b/Doc/c-api/veryhigh.rst
--- a/Doc/c-api/veryhigh.rst
+++ b/Doc/c-api/veryhigh.rst
@@ -144,6 +144,30 @@
    (:func:`sys.getfilesystemencoding`).  Returns ``0`` at EOF.
 
 
+.. c:data:: PyOS_InputHook
+
+   Can be set to point to a function with the prototype 
+   ``int (*PyOS_InputHook)(void)``.  
+   The function will be called when Python's interpreter prompt is
+   about to become idle and wait for user input from the terminal.
+   The return value is ignored.  Overriding this hook can be used to
+   integrate the interpreter's prompt with other event loops, as done
+   in the :file:`Modules/_tkinter.c` in the Python source code.
+
+
+.. c:data:: PyOS_ReadlineFunctionPointer
+
+   Can be set to point to a function with the prototype 
+   ``char *(*PyOS_ReadlineFunctionPointer)(FILE *stdin, FILE *stdout, char *prompt)``.
+   This function overrides the default function used to read a single
+   line of input at the interpreter's prompt.  The function is
+   expected to output the string *prompt* if it's not *NULL*, and then
+   read a line of input from the provided standard input file,
+   returning the resulting string.  For example, The :mod:`readline`
+   module sets this hook to provide line-editing and tab-completion
+   features.
+
+
 .. c:function:: struct _node* PyParser_SimpleParseString(const char *str, int start)
 
    This is a simplified interface to