diff --git a/ChangeLog b/ChangeLog
index 197ea247ad..9e33f24922 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2013-04-06  Carlos O'Donell  <carlos@redhat.com>
 
+	* math/README.libm-test (How can I generate "libm-test-ulps"?):
+	Use testrun.sh to run libm tests.
+
 	[BZ #15309]
 	* elf/dl-open.c (dl_open_worker): memset all of seen array.
 
diff --git a/math/README.libm-test b/math/README.libm-test
index 29294993fe..7003e5dc4d 100644
--- a/math/README.libm-test
+++ b/math/README.libm-test
@@ -48,8 +48,7 @@ the changes, post your patch, and check it in after review.
 
 To manually generate a new "libm-test-ulps" file, first remove "ULPs"
 file in the current directory, then you can execute for example:
-  /build/elf/ld.so --library--path /build/:/build/elf:/build/math \
-    test-double -u --ignore-max-ulp=yes
+    ./testrun.sh math/test-double -u --ignore-max-ulp=yes
 This generates a file "ULPs" with all double ULPs in it, ignoring any
 previously calculated ULPs, and running with the newly built dynamic
 loader and math library (assumes you didn't install your build).  Now