diff --git a/en_US.ISO8859-1/books/fdp-primer/overview/chapter.xml b/en_US.ISO8859-1/books/fdp-primer/overview/chapter.xml
index b0cf2cc198..6a9458063b 100644
--- a/en_US.ISO8859-1/books/fdp-primer/overview/chapter.xml
+++ b/en_US.ISO8859-1/books/fdp-primer/overview/chapter.xml
@@ -244,7 +244,7 @@
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- attach the .diff.txt.
+ attach the diff file.