diff --git a/pep-0567.rst b/pep-0567.rst
index ebe514c59..c3fb17f5e 100644
--- a/pep-0567.rst
+++ b/pep-0567.rst
@@ -263,10 +263,37 @@ as follows::
             ...
 
 
-CPython C API
--------------
+C API
+-----
 
-TBD
+1. ``PyContextVar * PyContextVar_New(char *name)``: create a
+   ``ContextVar`` object.
+
+2. ``PyObject * PyContextVar_Get(PyContextVar *)``:
+   return the value of the variable in the current context.
+
+3. ``PyContextToken * PyContextVar_Set(PyContextVar *, PyObject *)``:
+   set the value of the variable in the current context.
+
+4. ``PyContextVar_Reset(PyContextToken *)``:
+   reset the value of the context variable.
+
+5. ``PyContext * PyContext_New()``: create a new empty context.
+
+6. ``PyContext * PyContext_Get()``: get the current context.
+
+7. ``int PyContext_Set(PyContext *)``: set a new context as the
+   current for the current OS thread.  It is required to always
+   restore the previous context::
+
+      PyContext *old_ctx = PyContext_Get();
+      if (old_ctx == NULL) goto error;
+
+      if (PyContext_Set(new_ctx)) goto error;
+
+      // run some code
+
+      if (PyContext_Set(old_ctx)) goto error;
 
 
 Implementation