diff --git a/defs-calfeld-emulab b/defs-calfeld-emulab
index 0e9def41fba3036eb422c4e2e314130b8473638a..f24b604836221acebed21c3b42a4171e7723fd40 100644
--- a/defs-calfeld-emulab
+++ b/defs-calfeld-emulab
@@ -1,7 +1,7 @@
 #
 # This is the defaults definitions file for configure.
 #
-# Use the -with-DEFS=filename to specify your own. If you add a variable,
+# Use the --with-TBDEFS=filename to specify your own. If you add a variable,
 # be sure to go and update configure.in.
 #
 TBDBNAME=tbdb
diff --git a/defs-default b/defs-default
index c7e9b0965520bb5ed811866416fbb79f30a29558..c2e82ec58afd12b31aaea6a807b5363587f3f6b1 100644
--- a/defs-default
+++ b/defs-default
@@ -1,7 +1,7 @@
 #
 # This is the defaults definitions file for configure.
 #
-# Use the -with-DEFS=filename to specify your own. If you add a variable,
+# Use the --with-TBDEFS=filename to specify your own. If you add a variable,
 # be sure to go and update configure.in.
 #
 TBDBNAME=tbdb