More clarification in guidelines wrt rule 17

next/guidelines.html

@@ -1371,7 +1371,15 @@ <h2 id="the-clobber-rule">The clobber rule</h2>
 <code>clobber</code> rule in the example Makefile to see how to manage this.
 </p>
 <p class="leftbar">
-Do <strong>NOT</strong> rely on these tools for any other rule, either.
+In other words, for <code>make clobber</code>, do something like:
+</p>
+<pre><code>    clobber:
+            ${RM} -f foo bar baz</code></pre>
+<p>and <strong>NOT</strong> something like this:</p>
+<pre><code>    clobber:
+            -git clean -f</code></pre>
+<p class="leftbar">
+And do <strong>NOT</strong> use <code>git</code> for any other tool either.
 </p>
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next/guidelines.md

@@ -1200,9 +1200,27 @@ it will remove files that are not under `git(1)` control! Instead, see the
 </p>
 
 <p class="leftbar">
-Do **NOT** rely on these tools for any other rule, either.
+In other words, for `make clobber`, do something like:
 </p>
 
+
+``` <!---makefile-->
+    clobber:
+            ${RM} -f foo bar baz
+```
+
+and **NOT** something like this:
+
+``` <!---makefile-->
+    clobber:
+            -git clean -f
+```
+
+<p class="leftbar">
+And do **NOT** use `git` for any other tool either.
+</p>
+
+
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