diff --git a/src/tools/backend/backend_dirs.html b/src/tools/backend/backend_dirs.html
index 3ef940f0ca..c5bd3a52fe 100644
--- a/src/tools/backend/backend_dirs.html
+++ b/src/tools/backend/backend_dirs.html
@@ -9,6 +9,11 @@ PostgreSQL Backend Directories
by Bruce Momjian
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+Click on any of the section headings to see the source code for that section.
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