diff --git a/prism/etc/prism.pats b/prism/etc/prism.pats
index 6107eeb4..a750c8c5 100644
--- a/prism/etc/prism.pats
+++ b/prism/etc/prism.pats
@@ -37,7 +37,7 @@ nedit.highlightPatterns: PRISM:1:0{\n\
 		Identifier:"<([A-Za-z_][A-Za-z0-9_]*)>":::PRISM Identifier::\n\
 		Numeric:"<(([0-9]*(\\.)?[0-9]+([eE]([-+])?[0-9]+)?)|([1-9][0-9]*)|0)>":::PRISM Numeric::\n\
 	}
-nedit.languageModes: 	PRISM:.pm .nm .sm .pctl .csl::::::"!&|->:;,.()[]{}=<+*/'?""":
+nedit.languageModes: 	PRISM:.pm .nm .sm .pctl .csl .pp::::::"!&|->:;,.()[]{}=<+*/'?""":
 nedit.styles: 	PRISM Comment:darkGreen:Italic\n\
 	PRISM Identifier:darkRed:Plain\n\
 	PRISM Numeric:Blue:Plain\n\