Issue #29004: Document binascii.crc_hqx() implements CRC-CCITT
diff --git a/Doc/library/binascii.rst b/Doc/library/binascii.rst
index 5eb7c4b..38f616a 100644
--- a/Doc/library/binascii.rst
+++ b/Doc/library/binascii.rst
@@ -101,8 +101,10 @@
.. function:: crc_hqx(data, crc)
- Compute the binhex4 crc value of *data*, starting with an initial *crc* and
- returning the result.
+ Compute a 16-bit CRC value of *data*, starting with an initial *crc* and
+ returning the result. This uses the CRC-CCITT polynomial
+ *x*:sup:`16` + *x*:sup:`12` + *x*:sup:`5` + 1, often represented as
+ 0x1021. This CRC is used in the binhex4 format.
.. function:: crc32(data[, crc])
diff --git a/Modules/binascii.c b/Modules/binascii.c
index 06af60f..1e785fa 100644
--- a/Modules/binascii.c
+++ b/Modules/binascii.c
@@ -842,7 +842,7 @@
}
PyDoc_STRVAR(doc_crc_hqx,
-"(data, oldcrc) -> newcrc. Compute hqx CRC incrementally");
+"(data, oldcrc) -> newcrc. Compute CRC-CCITT incrementally");
static PyObject *
binascii_crc_hqx(PyObject *self, PyObject *args)