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diff --git a/doc/developer-guidelines.sgml b/doc/developer-guidelines.sgml
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--- a/doc/developer-guidelines.sgml
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@@ -241,6 +241,83 @@
<para>Note: Not all plugins are coded to expect ranges in this format yet.
There will be some work in providing multiple metrics.</para>
+
+ <table id="ExampleRanges"><title>Example ranges</title>
+ <tgroup cols="2">
+ <thead>
+ <row>
+ <entry><para>Range definition</para></entry>
+ <entry><para>Generate an alert if x...</para></entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry>10</entry>
+ <entry>&lt; 0 or &gt; 10, (outside the range of {0 .. 10})</entry>
+ </row>
+ <row>
+ <entry>10:</entry>
+ <entry>&lt; 10, (outside {10 .. &infin;})</entry>
+ </row>
+ <row>
+ <entry>~:10</entry>
+ <entry>&gt; 10, (outside the range of {-&infin; .. 10})</entry>
+ </row>
+ <row>
+ <entry>10:20</entry>
+ <entry>&lt; 10 or &gt; 20, (outside the range of {10 .. 20})</entry>
+ </row>
+ <row>
+ <entry>@10:20</entry>
+ <entry>&ge; 10 and &le; 20, (inside the range of {10 .. 20})</entry>
+ </row>
+ <row>
+ <entry>10</entry>
+ <entry>&lt; 0 or &gt; 10, (outside the range of {0 .. 10})</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ <table id="CommandLineExamples"><title>Command line examples</title>
+ <tgroup cols="2">
+ <thead>
+ <row>
+ <entry><para>Command line</para></entry>
+ <entry><para>Meaning</para></entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry>check_stuff -w10 -c20</entry>
+ <entry>Critical if "stuff" is over 20, else warn if over 10 (will be critical if "stuff" is less than 0)</entry>
+ </row>
+ <row>
+ <entry>check_stuff -w~:10 -c~:20</entry>
+ <entry>Same as above. Negative "stuff" is OK</entry>
+ </row>
+ <row>
+ <entry>check_stuff -w10: -c20</entry>
+ <entry>Critical if "stuff" is over 20, else warn if "stuff" is below 10 (will be critical if "stuff" is less than 0)</entry>
+ </row>
+ <row>
+ <entry>check_stuff -c1:</entry>
+ <entry>Critical if "stuff" is less than 1</entry>
+ </row>
+ <row>
+ <entry>check_stuff -w~:0 -c10</entry>
+ <entry>Critical if "stuff" is above 10; Warn if "stuff" is above zero</entry>
+ </row>
+ <row>
+ <entry>check_stuff -c5:6</entry>
+ <entry>The only noncritical range is 5:6</entry>
+ </row>
+ <row>
+ <entry>check_stuff -c10:20</entry>
+ <entry>Critical if "stuff" is 10 to 20</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
</section>
<section><title>Performance data</title>