1 files changed, 2 insertions, 1 deletions
diff --git a/configure b/configure
index d80d738fd1..eecd0ace74 100755
--- a/configure
+++ b/configure
@@ -1454,7 +1454,8 @@ Optional Features:
   --disable-build-nscd    disable building and installing the nscd daemon
   --disable-nscd          library functions will not contact the nscd daemon
   --enable-pt_chown       Enable building and installing pt_chown
-  --enable-tunables       Enable tunables support
+  --enable-tunables       Enable tunables support. Known values are 'yes',
+                          'no' and 'valstring'
   --enable-mathvec        Enable building and installing mathvec [default
                           depends on architecture]