diff --git a/.gitignore b/.gitignore
index 3cecbb4e305900d19a9e13058d052fe9007c1c6d..d88c0bcbf31e519a61c630f9b4a0884cbfea6b38 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ src/mergekmer
 .Rproj.user
 .Rhistory
 .Rprofile
+.kmer-diff.Rproj