ableegoldman commented on a change in pull request #10988:
URL: https://github.com/apache/kafka/pull/10988#discussion_r666428748



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File path: docs/streams/developer-guide/datatypes.html
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@@ -34,7 +34,7 @@
   <div class="section" id="data-types-and-serialization">
     <span id="streams-developer-guide-serdes"></span><h1>Data Types and 
Serialization<a class="headerlink" href="#data-types-and-serialization" 
title="Permalink to this headline"></a></h1>
     <p>Every Kafka Streams application must provide SerDes 
(Serializer/Deserializer) for the data types of record keys and record values 
(e.g. <code class="docutils literal"><span 
class="pre">java.lang.String</span></code>) to materialize the data when 
necessary.  Operations that require such SerDes information include: <code 
class="docutils literal"><span class="pre">stream()</span></code>, <code 
class="docutils literal"><span class="pre">table()</span></code>, <code 
class="docutils literal"><span class="pre">to()</span></code>, <code 
class="docutils literal"><span class="pre">repartition()</span></code>, <code 
class="docutils literal"><span class="pre">groupByKey()</span></code>, <code 
class="docutils literal"><span class="pre">groupBy()</span></code>.</p>
-    <p>You can provide SerDes by using either of these methods:</p>
+    <p>You can provide SerDes by using either of these methods, but you must 
use at least one of these methods:</p>
     <ul class="simple">
       <li>By setting default SerDes in the <code class="docutils 
literal"><span class="pre">java.util.Properties</span></code> config 
instance.</li>
       <li>By specifying explicit SerDes when calling the appropriate API 
methods, thus overriding the defaults.</li>

Review comment:
       Hm, dare I ask how many pages do this? Actually you should be able to do 
it using `sed` to programmatically go through each of the pages (if you've 
never used `sed` before it's a good thing to learn, you should be able to 
figure out how it works from googling for find&replace examples)
   
   That said, let's leave it out of this PR. Can you just file a ticket to do 
this in a followup PR? Then I think this one can be merged




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