diff --git a/feedparser/sanitizer.py b/feedparser/sanitizer.py
index 76be5700..890595f4 100644
--- a/feedparser/sanitizer.py
+++ b/feedparser/sanitizer.py
@@ -108,6 +108,8 @@ class HTMLSanitizer(BaseHTMLProcessor):
         "pre",
         "progress",
         "q",
+        "rt",
+        "ruby",
         "s",
         "samp",
         "section",