minor markup nits
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index eca2f11..e64299a 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -391,7 +391,8 @@
 
 A slicing selects a range of items in a sequence object (e.g., a
 string, tuple or list).  Slicings may be used as expressions or as
-targets in assignment or del statements.  The syntax for a slicing:
+targets in assignment or \keyword{del} statements.  The syntax for a
+slicing:
 \obindex{sequence}
 \obindex{string}
 \obindex{tuple}