diff --git a/doc/guide/preamble.sdf b/doc/guide/preamble.sdf
index 3d5f2fb85e..30218de126 100644
--- a/doc/guide/preamble.sdf
+++ b/doc/guide/preamble.sdf
@@ -103,6 +103,7 @@ Name|Long|Jump
 ANSI|American National Standards Institute|https://www.ansi.org/
 BSI|British Standards Institute|https://www.bsigroup.com/en-GB/
 COSINE|Co-operation and Open Systems Interconnection in Europe
+CPAN|Comprehensive Perl Archive Network|https://www.cpan.org/
 Cyrus|Project Cyrus|https://www.cyrusimap.org/
 FSF|Free Software Foundation|https://www.fsf.org/
 GNU|GNU Not Unix Project|https://www.gnu.org/