diff --git a/doc/src/sgml/images/genetic-algorithm.gv b/doc/src/sgml/images/genetic-algorithm.gv
index 80c354c2c8b..7912e165dea 100644
--- a/doc/src/sgml/images/genetic-algorithm.gv
+++ b/doc/src/sgml/images/genetic-algorithm.gv
@@ -36,6 +36,7 @@ digraph {
 
 	// edges
 	a1 -> a2 -> a3 -> a4;
+	// these trailing spaces output as "nbsp" (UTF8 NO-BREAK SPACE)
 	a4 -> a5[xlabel="false   ", fontsize=10];
 	a4 -> end[xlabel="true  ",  fontsize=10];
 	a5 -> a6 -> a7 -> a8 -> a9;
diff --git a/doc/src/sgml/images/genetic-algorithm.svg b/doc/src/sgml/images/genetic-algorithm.svg
index 2ce5f1b2712..fb9fdd1ba78 100644
--- a/doc/src/sgml/images/genetic-algorithm.svg
+++ b/doc/src/sgml/images/genetic-algorithm.svg
@@ -72,7 +72,7 @@
 <title>a4-&gt;end</title>
 <path fill="none" stroke="#000000" d="M259,-312.5834C259,-312.5834 259,-54.659 259,-54.659"/>
 <polygon fill="#000000" stroke="#000000" points="262.5001,-54.659 259,-44.659 255.5001,-54.6591 262.5001,-54.659"/>
-<text text-anchor="middle" x="246" y="-186.6212" font-family="sans-serif" font-size="10.00" fill="#000000">true</text>
+<text text-anchor="middle" x="246" y="-186.6212" font-family="sans-serif" font-size="10.00" fill="#000000">true  </text>
 </g>
 <!-- a5 -->
 <g id="node7" class="node">
@@ -85,7 +85,7 @@
 <title>a4-&gt;a5</title>
 <path fill="none" stroke="#000000" d="M144,-298.269C144,-298.269 144,-286.5248 144,-286.5248"/>
 <polygon fill="#000000" stroke="#000000" points="147.5001,-286.5248 144,-276.5248 140.5001,-286.5249 147.5001,-286.5248"/>
-<text text-anchor="middle" x="127" y="-284.3969" font-family="sans-serif" font-size="10.00" fill="#000000">false</text>
+<text text-anchor="middle" x="127" y="-284.3969" font-family="sans-serif" font-size="10.00" fill="#000000">false   </text>
 </g>
 <!-- a6 -->
 <g id="node8" class="node">