diff --git a/doc/.gitignore b/doc/.gitignore
index 1936cc1d4..deaaf2046 100644
--- a/doc/.gitignore
+++ b/doc/.gitignore
@@ -1 +1,2 @@
 html
+*.org.*.lean
diff --git a/hott/.gitignore b/hott/.gitignore
new file mode 100644
index 000000000..de9e6a3dd
--- /dev/null
+++ b/hott/.gitignore
@@ -0,0 +1,4 @@
+.ninja_deps
+.ninja_log
+TAGS
+build.ninja