fix typo #5687
diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 58b5798..1bba13a 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -60,7 +60,7 @@
"allowed to throw an IOError if they do not support a given operation.\n"
"\n"
"Extending IOBase is RawIOBase which deals simply with the reading and\n"
-"writing of raw bytes to a stream. FileIO subc lasses RawIOBase to provide\n"
+"writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide\n"
"an interface to OS files.\n"
"\n"
"BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Its\n"