diff --git a/util/install.sh b/util/install.sh
index d9b299e..bf4492d 100755
--- a/util/install.sh
+++ b/util/install.sh
@@ -842,7 +842,7 @@ exit 0
 }
 
 function usage {
-    printf '\nUsage: %s [-abcdfhikmnprtvVwxy03]\n\n' $(basename $0) >&2
+    printf '\nUsage: %s [-abcdefhikmnprtvVwxy03]\n\n' $(basename $0) >&2
 
     printf 'This install script attempts to install useful packages\n' >&2
     printf 'for Mininet. It should (hopefully) work on Ubuntu 11.10+\n' >&2
@@ -869,8 +869,8 @@ function usage {
     printf -- ' -v: install Open (V)switch\n' >&2
     printf -- ' -V <version>: install a particular version of Open (V)switch on Ubuntu\n' >&2
     printf -- ' -w: install OpenFlow (W)ireshark dissector\n' >&2
+    printf -- ' -x: install NO(X) Classic OpenFlow controller\n' >&2    
     printf -- ' -y: install R(y)u Controller\n' >&2
-    printf -- ' -x: install NO(X) Classic OpenFlow controller\n' >&2
     printf -- ' -0: (default) -0[fx] installs OpenFlow 1.0 versions\n' >&2
     printf -- ' -3: -3[fx] installs OpenFlow 1.3 versions\n' >&2
     exit 2