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-rw-r--r--Doc/reference/expressions.rst11
1 files changed, 9 insertions, 2 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 5b68468..72ad95e 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -354,8 +354,15 @@ called, allowing any pending :keyword:`finally` clauses to execute.
.. index:: object: generator
-The following generator's methods can be used to control the execution of a
-generator function:
+
+Generator-iterator methods
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This subsection describes the methods of a generator iterator. They can
+be used to control the execution of a generator function.
+
+Note that calling any of the generator methods below when the generator
+is already executing raises a :exc:`ValueError` exception.
.. index:: exception: StopIteration