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-rw-r--r--markdown/extensions/headerid.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/markdown/extensions/headerid.py b/markdown/extensions/headerid.py
index 2332abe..9c36a2b 100644
--- a/markdown/extensions/headerid.py
+++ b/markdown/extensions/headerid.py
@@ -73,7 +73,7 @@ import logging
logger = logging.getLogger('MARKDOWN')
-ID_CHARS = ascii_lowercase + digits + '-_'
+ID_CHARS = ascii_lowercase + digits + '-_.'
IDCOUNT_RE = re.compile(r'^(.*)_([0-9]+)$')