diff --git a/.gitignore b/.gitignore
index 9e6499be8..f6deb5be7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,6 @@ lcov.info
 link/
 link.tar.gz
 .vscode
+# Ignore files used by the "direnv" tool.
+.direnv
+.envrc