diff --git a/book/source/diag/OpenPGP_Certificate_packet.svg b/book/source/diag/OpenPGP_Signature_packet.svg
similarity index 100%
rename from book/source/diag/OpenPGP_Certificate_packet.svg
rename to book/source/diag/OpenPGP_Signature_packet.svg
diff --git a/book/source/diag/OpenPGP_Certificate_packet_2.svg b/book/source/diag/OpenPGP_Signature_packet_2.svg
similarity index 100%
rename from book/source/diag/OpenPGP_Certificate_packet_2.svg
rename to book/source/diag/OpenPGP_Signature_packet_2.svg