diff --git a/tools/tools/README b/tools/tools/README
index 531c5536fdc..7a4cca7090d 100644
--- a/tools/tools/README
+++ b/tools/tools/README
@@ -16,8 +16,6 @@ commitsdb	A tool for reconstructing commit history using md5
 crypto		Test and exercise tools related to the crypto framework
 cxgbetool	A tool for the cxgbe(4) driver.
 cxgbtool	A tool for the cxgb(4) driver.
-diffburst	OBSOLETE: equivalent functionality is available via split -p.
-		For example: "split -p ^diff < patchfile". See split(1).
 drm		Tools specific to the DRM/KMS device drivers.
 editing		Editor modes and the like to help editing FreeBSD code.
 epfe 		Extract printing filter examples from printing.sgml.