diff --git a/book/source/diag/subkey_binding.png b/book/source/diag/subkey_binding.png
index 4b898f4..39c5b7e 100644
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index 4118dac..9e25f95 100644
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-         id="tspan17563">This arrow is actually a shorthand</tspan><tspan
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-         id="tspan17565">for the subkey binding signature</tspan></text>
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-         id="tspan2143-5-0"> Primary key</tspan><tspan
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-         x="49.445145"
-         y="162.76167"
+         x="50.257763"
+         y="154.98778"
          id="tspan602">(for encryption)</tspan></text>
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-       x="90.882607"
-       y="152.2755"
+       x="93.832245"
+       y="160.96596"
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          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:2.82222px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-         x="90.882607"
-         y="152.2755"
+         x="93.832245"
+         y="160.96596"
          id="tspan602-7">Subkey binding signature</tspan></text>
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-       height="36.933998"
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+       width="33.132545"
+       height="28.793825"
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@@ -323,22 +278,16 @@
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@@ -351,62 +300,82 @@
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+       style="font-variation-settings:'wght' 700;fill:#fdfec4;fill-opacity:1;stroke:#000000;stroke-width:0.267136;stroke-dasharray:none"
        id="rect481"
-       width="37.568142"
-       height="32.938725"
-       x="88.826698"
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+       width="44.146259"
+       height="50.007595"
+       x="90.447762"
+       y="107.99747" />
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        style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-       x="90.007591"
-       y="120.06777"
+       x="91.595093"
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-         x="90.007591"
-         y="120.06777">Metadata associated</tspan><tspan
+         x="91.595093"
+         y="111.6011"
+         id="tspan14771">Signature over:</tspan><tspan
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          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-         x="90.007591"
-         y="124.47749"
-         id="tspan14771">with this Signature:</tspan><tspan
+         x="91.595093"
+         y="116.01082"
+         id="tspan4">- primary key,</tspan><tspan
          sodipodi:role="line"
          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-         x="90.007591"
-         y="128.88722"
-         id="tspan14773" /><tspan
+         x="91.595093"
+         y="120.42055"
+         id="tspan2">- subkey.</tspan><tspan
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          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-         x="90.007591"
-         y="133.29695"
-         id="tspan2109-2-9">- key flags</tspan><tspan
+         x="91.595093"
+         y="124.83027"
+         id="tspan6" /><tspan
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          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-         x="90.007591"
-         y="137.70667"
-         id="tspan14777">- creation time</tspan><tspan
+         x="91.595093"
+         y="129.23999"
+         id="tspan1">Additional Metadata</tspan><tspan
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          style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
-         x="90.007591"
-         y="142.11639"
+         x="91.595093"
+         y="133.64972"
+         id="tspan5">(Subpackets):</tspan><tspan
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+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
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+         id="tspan8" /><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="142.46918"
+         id="tspan14777">- signature creation time</tspan><tspan
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+         y="146.87889"
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-         id="tspan2111-9-1">- ...</tspan><tspan
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-         y="150.93585"
+         x="91.595093"
+         y="155.69835"
+         id="tspan3">- issuer fingerprint</tspan><tspan
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