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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 22f5cab200..4a77411b71 100644
--- a/configure.ac
+++ b/configure.ac
@@ -423,7 +423,7 @@ fi
 
 AC_ARG_ENABLE([tunables],
 	      [AS_HELP_STRING([--enable-tunables],
-	       [Enable tunables support])],
+	       [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
 	      [have_tunables=$enableval],
 	      [have_tunables=no])
 AC_SUBST(have_tunables)