diff --git a/TeX.gitignore b/TeX.gitignore
index e9642441..87a82f2c 100644
--- a/TeX.gitignore
+++ b/TeX.gitignore
@@ -138,6 +138,9 @@ acs-*.bib
 *.trc
 *.xref
 
+# hypdoc
+*.hd
+
 # hyperref
 *.brf