update documentation for tag dev

dev/c.html

@@ -1442,7 +1442,8 @@ <h2>Low-level reader/visitor interfaces<a class="headerlink" href="#low-level-re
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 <em>#include &lt;geoarrow.h&gt;</em></div>
 <p>Well-known text writer. </p>
-<p>This struct also contains options for well-known text serialization. These options can be modified from the defaults after <a class="reference internal" href="#group__geoarrow-visitor_1ga96d811b269e458a4468864367bbad574"><span class="std std-ref">GeoArrowWKTWriterInit()</span></a> and before <a class="reference internal" href="#group__geoarrow-visitor_1gaa91bfc0151ce2ab8ed9b2a586ac55515"><span class="std std-ref">GeoArrowWKTWriterInitVisitor()</span></a>. </p>
+<p>This struct also contains options for well-known text serialization. These options can be modified from the defaults after <a class="reference internal" href="#group__geoarrow-visitor_1ga96d811b269e458a4468864367bbad574"><span class="std std-ref">GeoArrowWKTWriterInit()</span></a> and before <a class="reference internal" href="#group__geoarrow-visitor_1gaa91bfc0151ce2ab8ed9b2a586ac55515"><span class="std std-ref">GeoArrowWKTWriterInitVisitor()</span></a>.</p>
+<p>Note that whether or not GeoArrow was compiled with ryu has a significant impact on the output: notably, ryu is locale-independent and much faster. GeoArrow can fall back on using snprintf(); however, this will result in invalid WKT for locales other than the C locale. </p>
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 <p class="breathe-sectiondef-title rubric" id="breathe-section-title-public-members">Public Members</p>
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