diff --git a/.reuse/dep5 b/.reuse/dep5
index d968ced..bee0e46 100644
--- a/.reuse/dep5
+++ b/.reuse/dep5
@@ -7,6 +7,6 @@ Files: book/source/diag/*.png  book/source/diag/*.svg
 Copyright: 2023  The "Notes on OpenPGP" project
 License: CC-BY-SA-4.0
 
-Files: book/source/mermaid/*.md  book/source/mermaid/*.png
+Files: book/source/mermaid/*.png
 Copyright: 2023  The "Notes on OpenPGP" project
 License: CC-BY-SA-4.0
diff --git a/book/source/mermaid/06-terminology.md b/book/tmp/06-terminology.md
similarity index 93%
rename from book/source/mermaid/06-terminology.md
rename to book/tmp/06-terminology.md
index 4e49a41..9e40dd7 100644
--- a/book/source/mermaid/06-terminology.md
+++ b/book/tmp/06-terminology.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2023 The "Notes on OpenPGP" project
+SPDX-License-Identifier: CC-BY-SA-4.0
+-->
+
 ```{mermaid}
 %%{ init: { 'flowchart': { 'curve': '' } } }%%
 flowchart LR