diff --git a/app/assets/stylesheets/keywords.css b/app/assets/stylesheets/keywords.css
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+.keyword-explanation {
+  padding-bottom: 20px;
+}
diff --git a/app/views/tutorials/keywords.html.erb b/app/views/tutorials/keywords.html.erb
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+<h1>Keywords</h1>
+
+<hr />
+
+<h3 id="module">Module</h3>
+
+<p class="keyword-explanation">Represents a fragment of the software. Every node in the processing tree generated by the Kalibro processor is a module. It can be a software package, file or the whole software.</p>
+
+<h3 id="range">Range</h3>
+
+<p class="keyword-explanation">Represents numerical intervals that may contain the value calculated for a given metric. Ranges combined with readings provide interpretations for metric results.</p>
+
+<h3 id="reading">Reading</h3>
+
+<p class="keyword-explanation">The interpretation given to a metric result (e.g., "Good", "Complex", "A"). Readings combined with ranges provide interpretations for metric results.</p>
+
+<h3 id="reading-group">Reading Group</h3>
+
+<p class="keyword-explanation">A set of readings that make sense when grouped together (e.g., "Good" and "Bad", "Simple" and "Complex").</p>
+
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