diff --git a/Doc/library/_thread.rst b/Doc/library/_thread.rst
index e7e7504..751c3e8 100644
--- a/Doc/library/_thread.rst
+++ b/Doc/library/_thread.rst
@@ -94,7 +94,7 @@
    *size* argument specifies the stack size to be used for subsequently created
    threads, and must be 0 (use platform or configured default) or a positive
    integer value of at least 32,768 (32kB). If changing the thread stack size is
-   unsupported, a :exc:`ThreadError` is raised.  If the specified stack size is
+   unsupported, a :exc:`RuntimeError` is raised.  If the specified stack size is
    invalid, a :exc:`ValueError` is raised and the stack size is unmodified.  32kB
    is currently the minimum supported stack size value to guarantee sufficient
    stack space for the interpreter itself.  Note that some platforms may have
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index 2b43ee5..7527bc5 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -174,7 +174,7 @@
    *size* argument specifies the stack size to be used for subsequently created
    threads, and must be 0 (use platform or configured default) or a positive
    integer value of at least 32,768 (32kB). If changing the thread stack size is
-   unsupported, a :exc:`ThreadError` is raised.  If the specified stack size is
+   unsupported, a :exc:`RuntimeError` is raised.  If the specified stack size is
    invalid, a :exc:`ValueError` is raised and the stack size is unmodified.  32kB
    is currently the minimum supported stack size value to guarantee sufficient
    stack space for the interpreter itself.  Note that some platforms may have