diff --git a/opensym2017/content/01-introduction.tex b/opensym2017/content/01-introduction.tex
index 7699763..3716478 100644
--- a/opensym2017/content/01-introduction.tex
+++ b/opensym2017/content/01-introduction.tex
@@ -46,5 +46,5 @@ changes in the team).
 Figure \ref{fig:spb} shows the home page of this integrated platform.
 The development tried to be as faithful as possible to FOSS development.
 All development was done in the open, and the changes we needed in the
-tools user were contributed back to their communities.
+tools were contributed back to their communities.
 
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