diff -ur man-pages-3.52.orig/man7/futex.7 man-pages-3.52/man7/futex.7
--- man-pages-3.52.orig/man7/futex.7	2013-07-04 12:54:02.000000000 +0200
+++ man-pages-3.52/man7/futex.7	2013-07-22 10:17:43.002809131 +0200
@@ -51,7 +51,7 @@
 .SS Semantics
 .PP
 Any futex operation starts in user space,
-but it may necessary to communicate with the kernel using the
+but it may be necessary to communicate with the kernel using the
 .BR futex (2)
 system call.
 .PP