diff --git a/en-US/F.xml b/en-US/F.xml
index 96a29c4..15e7f5e 100644
--- a/en-US/F.xml
+++ b/en-US/F.xml
@@ -94,7 +94,7 @@
 			<term>file extensions (general usage)</term>
 			 <listitem>
 				<para>
-					Write file extensions in all caps and without periods (for example, "a PDF file"), unless the file name is also referenced (for example, "Save as example.pdf").
+					See <citetitle>File names, file types, and directory names</citetitle> in <citetitle>The IBM Style Guide</citetitle>.
 				</para>
 
 			</listitem>