diff --git a/static/img/docs/checks_durations.png b/static/img/docs/checks_durations.png
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diff --git a/static/img/docs/details_durations.png b/static/img/docs/details_durations.png
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diff --git a/templates/docs/configuring_notifications.html b/templates/docs/configuring_notifications.html
index fdeb72e0..024d113d 100644
--- a/templates/docs/configuring_notifications.html
+++ b/templates/docs/configuring_notifications.html
@@ -35,12 +35,12 @@ Set them up in <a href="../../accounts/profile/">Account Settings › Email Repo
 <h2>Monthly Reports</h2>
 <p>SITE_NAME sends monthly email reports at the start of each month. Use them
 to make sure all checks have their expected state and nothing has
-fallen "through the cracks".</p>
+"fallen through the cracks".</p>
 <p>A monthly report shows checks from all projects you have access
 to. For each check it lists:</p>
 <ul>
 <li>check's current status</li>
-<li>the number of downtimes for two previous months</li>
-<li>the downtime duration for two previous months</li>
+<li>the number of downtimes by month, for the two previous months</li>
+<li>the total downtime duration by month, for the two previous months</li>
 </ul>
 <p><img alt="Example monthly report" src="IMG_URL/monthly_report.png" /></p>
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diff --git a/templates/docs/configuring_notifications.md b/templates/docs/configuring_notifications.md
index e0631078..6a2fdc5e 100644
--- a/templates/docs/configuring_notifications.md
+++ b/templates/docs/configuring_notifications.md
@@ -44,13 +44,13 @@ Set them up in [Account Settings › Email Reports](../../accounts/profile/):
 
 SITE_NAME sends monthly email reports at the start of each month. Use them
 to make sure all checks have their expected state and nothing has
-fallen "through the cracks".
+"fallen through the cracks".
 
 A monthly report shows checks from all projects you have access
 to. For each check it lists:
 
 * check's current status
-* the number of downtimes for two previous months
-* the downtime duration for two previous months
+* the number of downtimes by month, for the two previous months
+* the total downtime duration by month, for the two previous months
 
 ![Example monthly report](IMG_URL/monthly_report.png)
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diff --git a/templates/docs/measuring_script_run_time.html b/templates/docs/measuring_script_run_time.html
index 1c77ecb7..a957de54 100644
--- a/templates/docs/measuring_script_run_time.html
+++ b/templates/docs/measuring_script_run_time.html
@@ -27,4 +27,15 @@ success within its configured "Grace Time", or it will get marked as "down".</p>
 
 <span class="c1"># Signal success:</span>
 <span class="n">requests</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">URL</span><span class="p">)</span>
-</pre></div>
\ No newline at end of file
+</pre></div>
+
+
+<h2>Viewing Measured Run Times</h2>
+<p>When SITE_NAME receives a "start" signal followed by a regular ping or a "fail"
+signal, and the two events are less than 24 hours apart,
+you will see the time delta displayed in the list of checks. If the two events are
+more than 24 hours apart, they are assumed to be unrelated, and the time delta is
+not displayed.</p>
+<p><img alt="List of checks with durations" src="IMG_URL/checks_durations.png" /></p>
+<p>You can also see durations of the previous runs when viewing an individual check:</p>
+<p><img alt="Log of received pings with durations" src="IMG_URL/details_durations.png" /></p>
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diff --git a/templates/docs/measuring_script_run_time.md b/templates/docs/measuring_script_run_time.md
index fb289bf0..b0644b18 100644
--- a/templates/docs/measuring_script_run_time.md
+++ b/templates/docs/measuring_script_run_time.md
@@ -33,3 +33,17 @@ print("F(42) = %d" % fib(42))
 # Signal success:
 requests.get(URL)
 ```
+
+## Viewing Measured Run Times
+
+When SITE_NAME receives a "start" signal followed by a regular ping or a "fail"
+signal, and the two events are less than 24 hours apart,
+you will see the time delta displayed in the list of checks. If the two events are
+more than 24 hours apart, they are assumed to be unrelated, and the time delta is
+not displayed.
+
+![List of checks with durations](IMG_URL/checks_durations.png)
+
+You can also see durations of the previous runs when viewing an individual check:
+
+![Log of received pings with durations](IMG_URL/details_durations.png)
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