docs: updated heatmap docs

50764602 · Torkel Ödegaard · 2e7ac8f2 · 50764602
Commit 50764602 authored May 11, 2017 by Torkel Ödegaard
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docs/sources/features/panels/heatmap.md
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 ![](/img/docs/v43/heatmap_panel.png)

-The Heatmap panel allows you to view histograms over time.
+The Heatmap panel allows you to view histograms over time. To fully understand and use this panel you need
+understand what Histograms are and how they are created. Read on below to for a quick introduction to the
+term Histogram.

 ## Histograms and buckets