diff --git a/documentation/Installation.txt b/documentation/Installation.txt
index f50f70bf0b4948501b3d063b7fe58746bc6256cd..6a30cd3bbd9ca832c3205592aeedabf12f64d740 100644
--- a/documentation/Installation.txt
+++ b/documentation/Installation.txt
@@ -179,7 +179,7 @@ Building the Manual
 From 2.0.99 on, the manual is in reStructureText format. This format
 is (more or less) readable plain text, so this section is optional.
 
-Building the manual means generating a set of html pages add maybe a
+Building the manual means generating a set of html pages and maybe a
 single pdf from the sources.
 
 The html pages are generated by issuing::