diff --git a/doc/src/sgml/docguide.sgml b/doc/src/sgml/docguide.sgml
index 03b6356134a..3e571f33ad8 100644
--- a/doc/src/sgml/docguide.sgml
+++ b/doc/src/sgml/docguide.sgml
@@ -239,7 +239,7 @@ right, and I can verify the document with "nsgmls -s docguide.sgml".
Building Documentation
-GNU make is used to build documentation from the DocBook sources.
+GNU make is used to build documentation from the DocBook sources.
There are a few environment definitions which may need to be set or modified for your installation.
The Makefile looks for
doc/../src/Makefile