Index: developer/polybool/algo.html
===================================================================
--- developer/polybool/algo.html	(revision 36691)
+++ developer/polybool/algo.html	(revision 36692)
@@ -274,7 +274,7 @@
 <p>
 (Predicate 1.) After the first step:
 <ul>
-	<li> Any par of edges of A and B intersect at their endpoints (and
+	<li> Any pair of edges of A and B intersect at their endpoints (and
 	     may or may not overlap, but if they overlap, they overlap in full
 	     length)
 	<li> Every edge of Pc: