diff --git a/documentation/content/en/books/fdp-primer/examples/_index.adoc b/documentation/content/en/books/fdp-primer/examples/_index.adoc
--- a/documentation/content/en/books/fdp-primer/examples/_index.adoc
+++ b/documentation/content/en/books/fdp-primer/examples/_index.adoc
@@ -154,7 +154,7 @@
 
 This is the first section in my article.
 
-== My First Sub-Section
+=== My First Sub-Section
 
 This is the first sub-section in my article.
 
diff --git a/documentation/content/en/books/fdp-primer/examples/_index.po b/documentation/content/en/books/fdp-primer/examples/_index.po
--- a/documentation/content/en/books/fdp-primer/examples/_index.po
+++ b/documentation/content/en/books/fdp-primer/examples/_index.po
@@ -194,7 +194,7 @@
 msgid "This is the first section in my article."
 msgstr ""
 
-#. type: Title ==
+#. type: Title ===
 #: documentation/content/en/books/fdp-primer/examples/_index.adoc:157
 #, no-wrap
 msgid "My First Sub-Section"