diff --git a/README.md b/README.md
index c6d69ef..ff45ef7 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Inweb 7.2.1
 
-[Version](notes/versioning.md): 7.2.1-beta+1B61 'Escape to Danger' (4 April 2024)
+[Version](notes/versioning.md): 7.2.1-beta+1B62 'Escape to Danger' (13 April 2024)
 
 ## About Inweb
 
diff --git a/build.txt b/build.txt
index 3fae2b8..da8ba46 100644
--- a/build.txt
+++ b/build.txt
@@ -1,3 +1,3 @@
 Prerelease: beta
-Build Date: 4 April 2024
-Build Number: 1B61
+Build Date: 13 April 2024
+Build Number: 1B62
diff --git a/docs/foundation-module/5-im.html b/docs/foundation-module/5-im.html
index cb3f771..810dc31 100644
--- a/docs/foundation-module/5-im.html
+++ b/docs/foundation-module/5-im.html
@@ -1298,7 +1298,9 @@ <h1><a href="../index.html">
 <span class="plain-syntax">            </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">);</span>
 <span class="plain-syntax">            </span><a href="4-sm.html#SP15" class="function-link"><span class="function-syntax">Str::clear</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">line_colouring</span><span class="plain-syntax">);</span>
 <span class="plain-syntax">        } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
-<span class="plain-syntax">            </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">md</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">stashed</span><span class="plain-syntax">, </span><span class="identifier-syntax">k</span><span class="plain-syntax">));</span>
+<span class="plain-syntax">            </span><span class="identifier-syntax">inchar32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><a href="4-sm.html#SP13" class="function-link"><span class="function-syntax">Str::get_at</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">md</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">stashed</span><span class="plain-syntax">, </span><span class="identifier-syntax">k</span><span class="plain-syntax">);</span>
+<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> == </span><span class="character-syntax">'\t'</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><span class="string-syntax">"    "</span><span class="plain-syntax">);</span>
+<span class="plain-syntax">            </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">PUT_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><span class="identifier-syntax">c</span><span class="plain-syntax">);</span>
 <span class="plain-syntax">        }</span>
 <span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">k</span><span class="plain-syntax"> == </span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">md</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">stashed</span><span class="plain-syntax">) - </span><span class="constant-syntax">1</span><span class="plain-syntax">) &amp;&amp; (</span><a href="4-sm.html#SP8" class="function-link"><span class="function-syntax">Str::len</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">line</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">))</span>
 <span class="plain-syntax">            </span><span class="named-paragraph-container code-font"><a href="5-im.html#SP3_2_4_1" class="named-paragraph-link"><span class="named-paragraph">Render line as code</span><span class="named-paragraph-number">3.2.4.1</span></a></span><span class="plain-syntax">;</span>
diff --git a/docs/goldbach/goldbach.pdf b/docs/goldbach/goldbach.pdf
index 9e4f256..07670e9 100644
Binary files a/docs/goldbach/goldbach.pdf and b/docs/goldbach/goldbach.pdf differ
diff --git a/foundation-module/Chapter 5/Inform-Flavoured Markdown.w b/foundation-module/Chapter 5/Inform-Flavoured Markdown.w
index 415475b..6eca515 100644
--- a/foundation-module/Chapter 5/Inform-Flavoured Markdown.w	
+++ b/foundation-module/Chapter 5/Inform-Flavoured Markdown.w	
@@ -1113,7 +1113,9 @@ and this is fiddly but elementary in the usual way of HTML tables:
 			Str::clear(line);
 			Str::clear(line_colouring);
 		} else {
-			PUT_TO(line, Str::get_at(md->stashed, k));
+			inchar32_t c = Str::get_at(md->stashed, k);
+			if (c == '\t') WRITE_TO(line, "    ");
+			else PUT_TO(line, c);
 		}
 		if ((k == Str::len(md->stashed) - 1) && (Str::len(line) > 0))
 			@<Render line as code@>;