diff --git a/lispref/positions.texi b/lispref/positions.texi
index 22a800a2216..12ec9f7ff4e 100644
--- a/lispref/positions.texi
+++ b/lispref/positions.texi
@@ -389,6 +389,7 @@ In an interactive call, @var{count} is the numeric prefix argument.
 
 @defun count-lines start end
 @cindex lines in region
+@anchor{Definition of count-lines}
 This function returns the number of lines between the positions
 @var{start} and @var{end} in the current buffer.  If @var{start} and
 @var{end} are equal, then it returns 0.  Otherwise it returns at least