diff --git a/docs/yap.tex b/docs/yap.tex
index a530bffcf..fe181eb90 100644
--- a/docs/yap.tex
+++ b/docs/yap.tex
@@ -6960,7 +6960,7 @@ Space in kbytes currently being used and still available for the trail.
 
 @item walltime
 @findex walltime (statistics/2 option)
-@code{[@var{Time since Boot},@var{Time From Last Call to Runtime}]}
+@code{[@var{Time since Boot},@var{Time From Last Call to Walltime}]}
 @* 
 This gives the clock time in milliseconds since starting Prolog.