diff --git a/.gitignore b/.gitignore
index afa92a6..4cce5d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,4 +14,8 @@ _minted*/*
 *.tdo
 *.synctex*
 *.synctex.gz
-article.swimmer-framework-contact.springer.fdb_latexmk
+*.fdb_latexmk
+*.fls
+*.idx
+*.ilg
+*.ind
diff --git a/article.swimmer-framework-contact.springer.tex b/article.swimmer-framework-contact.springer.tex
index 5b81cd2..6208e83 100644
--- a/article.swimmer-framework-contact.springer.tex
+++ b/article.swimmer-framework-contact.springer.tex
@@ -37,6 +37,7 @@
 }
 
 % Feel++ macro 
+\usepackage{xspace}
 \newcommand{\feelpp}{Feel\nolinebreak\hspace{-.05em}\raisebox{.4ex}{\tiny\bf +}\nolinebreak\hspace{-.10em}\raisebox{.4ex}{\tiny\bf +}\xspace}
 
 \newcommand{\review}[1]{\textcolor{blue}{#1}}