diff --git a/ignore/src/types.rs b/ignore/src/types.rs
index 8d8d777..0acebb9 100644
--- a/ignore/src/types.rs
+++ b/ignore/src/types.rs
@@ -272,6 +272,7 @@ const DEFAULT_TYPES: &'static [(&'static str, &'static [&'static str])] = &[
     ("vim", &["*.vim"]),
     ("vimscript", &["*.vim"]),
     ("wiki", &["*.mediawiki", "*.wiki"]),
+    ("webidl", &["*.idl", "*.widl"]),
     ("xml", &["*.xml", "*.xml.dist"]),
     ("yacc", &["*.y"]),
     ("yaml", &["*.yaml", "*.yml"]),