diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index 9d2cdf5fb7..7873fa82a5 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -692,6 +692,11 @@ form.
    metacharacters in it.
 
 
+.. function:: purge()
+
+   Clear the regular expression cache.
+
+
 .. exception:: error
 
    Exception raised when a string passed to one of the functions here is not a