2 files changed, 21 insertions, 0 deletions
diff --git a/inst/web/templates/content/help/panel.html b/inst/web/templates/content/help/panel.html
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+++ b/inst/web/templates/content/help/panel.html
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+<div class="accordion-item">
+  <h2 class="accordion-header">
+    <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#{{ id }}">
+      {{ header }}
+    </button>
+  </h2>
+  <div id="{{ id }}" class="accordion-collapse collapse" data-bs-parent="#help-accordion">
+    <div class="accordion-body">
+      {{ htmlTemplate(paste0("templates/content/help/", id, ".html")) }}
+    </div>
+  </div>
+</div>
diff --git a/inst/web/templates/content/help/serial-interval.html b/inst/web/templates/content/help/serial-interval.html
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+++ b/inst/web/templates/content/help/serial-interval.html
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+<p>Reference: <a href="https://en.wikipedia.org/wiki/Serial_interval" target="_blank"><em>Wikipedia</em></a>
+<p>
+  The serial interval (SI) is not one of the estimators. It is a parameter required by most of the estimators, and can
+  also be estimated by some of them (if not specified).
+</p>
+<p>
+  The SI is defined as the average time between successive infections in a chain of transmission (i.e., the time between
+  the infection of an infected individual and their subsequent transmissions).
+</p>