diff --git a/Doc/c-api/init.rst b/Doc/c-api/init.rst
index dac37e1..53fc735 100644
--- a/Doc/c-api/init.rst
+++ b/Doc/c-api/init.rst
@@ -161,7 +161,7 @@
    haven't been explicitly destroyed at that point.
 
 
-.. cfunction:: void Py_SetProgramName(char *name)
+.. cfunction:: void Py_SetProgramName(wchar_t *name)
 
    .. index::
       single: Py_Initialize()
@@ -170,11 +170,12 @@
 
    This function should be called before :cfunc:`Py_Initialize` is called for
    the first time, if it is called at all.  It tells the interpreter the value
-   of the ``argv[0]`` argument to the :cfunc:`main` function of the program.
+   of the ``argv[0]`` argument to the :cfunc:`main` function of the program
+   (converted to wide characters).
    This is used by :cfunc:`Py_GetPath` and some other functions below to find
    the Python run-time libraries relative to the interpreter executable.  The
    default value is ``'python'``.  The argument should point to a
-   zero-terminated character string in static storage whose contents will not
+   zero-terminated wide character string in static storage whose contents will not
    change for the duration of the program's execution.  No code in the Python
    interpreter will change the contents of this storage.
 
@@ -188,7 +189,7 @@
    value.
 
 
-.. cfunction:: char* Py_GetPrefix()
+.. cfunction:: wchar_t* Py_GetPrefix()
 
    Return the *prefix* for installed platform-independent files. This is derived
    through a number of complicated rules from the program name set with
@@ -201,7 +202,7 @@
    It is only useful on Unix.  See also the next function.
 
 
-.. cfunction:: char* Py_GetExecPrefix()
+.. cfunction:: wchar_t* Py_GetExecPrefix()
 
    Return the *exec-prefix* for installed platform-*dependent* files.  This is
    derived through a number of complicated rules from the program name set with
@@ -236,7 +237,7 @@
    platform.
 
 
-.. cfunction:: char* Py_GetProgramFullPath()
+.. cfunction:: wchar_t* Py_GetProgramFullPath()
 
    .. index::
       single: Py_SetProgramName()
@@ -249,7 +250,7 @@
    to Python code as ``sys.executable``.
 
 
-.. cfunction:: char* Py_GetPath()
+.. cfunction:: wchar_t* Py_GetPath()
 
    .. index::
       triple: module; search; path
@@ -342,7 +343,7 @@
    ``sys.version``.
 
 
-.. cfunction:: void PySys_SetArgv(int argc, char **argv)
+.. cfunction:: void PySys_SetArgv(int argc, wchar_t **argv)
 
    .. index::
       single: main()
diff --git a/Doc/c-api/sys.rst b/Doc/c-api/sys.rst
index 7696811..2a98c9d 100644
--- a/Doc/c-api/sys.rst
+++ b/Doc/c-api/sys.rst
@@ -84,11 +84,11 @@
 
    Reset :data:`sys.warnoptions` to an empty list.
 
-.. cfunction:: void PySys_AddWarnOption(char *s)
+.. cfunction:: void PySys_AddWarnOption(wchar_t *s)
 
    Append *s* to :data:`sys.warnoptions`.
 
-.. cfunction:: void PySys_SetPath(char *path)
+.. cfunction:: void PySys_SetPath(wchar_t *path)
 
    Set :data:`sys.path` to a list object of paths found in *path* which should
    be a list of paths separated with the platform's search path delimiter
diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index 448cf68..17c25d5 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -336,6 +336,8 @@
 .. cfunction:: PyObject* PyUnicode_FromWideChar(const wchar_t *w, Py_ssize_t size)
 
    Create a Unicode object from the :ctype:`wchar_t` buffer *w* of the given size.
+   Passing -1 as the size indicates that the function must itself compute the length,
+   using wcslen.
    Return *NULL* on failure.
 
 
diff --git a/Doc/c-api/veryhigh.rst b/Doc/c-api/veryhigh.rst
index 6a3f91d..2378c76 100644
--- a/Doc/c-api/veryhigh.rst
+++ b/Doc/c-api/veryhigh.rst
@@ -25,16 +25,18 @@
 the same library that the Python runtime is using.
 
 
-.. cfunction:: int Py_Main(int argc, char **argv)
+.. cfunction:: int Py_Main(int argc, wchar_t **argv)
 
-   The main program for the standard interpreter.  This is made available for
-   programs which embed Python.  The *argc* and *argv* parameters should be
-   prepared exactly as those which are passed to a C program's :cfunc:`main`
-   function.  It is important to note that the argument list may be modified (but
-   the contents of the strings pointed to by the argument list are not). The return
-   value will be the integer passed to the :func:`sys.exit` function, ``1`` if the
-   interpreter exits due to an exception, or ``2`` if the parameter list does not
-   represent a valid Python command line.
+   The main program for the standard interpreter.  This is made
+   available for programs which embed Python.  The *argc* and *argv*
+   parameters should be prepared exactly as those which are passed to
+   a C program's :cfunc:`main` function (converted to wchar_t
+   according to the user's locale).  It is important to note that the
+   argument list may be modified (but the contents of the strings
+   pointed to by the argument list are not). The return value will be
+   the integer passed to the :func:`sys.exit` function, ``1`` if the
+   interpreter exits due to an exception, or ``2`` if the parameter
+   list does not represent a valid Python command line.
 
 
 .. cfunction:: int PyRun_AnyFile(FILE *fp, const char *filename)