diff --git a/libidu/id-lang.map b/libidu/id-lang.map
index 7edb860..6dccd28 100644
--- a/libidu/id-lang.map
+++ b/libidu/id-lang.map
@@ -92,3 +92,5 @@ Makefile.*		make
 
 *.gz			FILTER gzip -d <%s
 *.Z			FILTER gzip -d <%s
+
+*.nix			text