diff --git a/doc/Polygon.txt b/doc/Polygon.txt
index f4af546..9b5d9d3 100644
--- a/doc/Polygon.txt
+++ b/doc/Polygon.txt
@@ -132,7 +132,7 @@ Operations on Polygon Objects
 
 :p & q:
     intersection: a polygon with the area that is covered by both p and q
-:p \| q:
+:p | q:
     union: a polygon containing the area that is covered by p or q or both
 :p - q:
     difference: a polygon with the area of p that is not covered by q
@@ -778,4 +778,4 @@ Get information on a gpc/gpf file.
     - withHoles: file contains hole-flags
 
 .. footer::
-   ###Page###
\ No newline at end of file
+   ###Page###