diff --git a/include/boost/config/posix_features.hpp b/include/boost/config/posix_features.hpp
index b23d8992..e8e23912 100644
--- a/include/boost/config/posix_features.hpp
+++ b/include/boost/config/posix_features.hpp
@@ -23,9 +23,9 @@
       // POSIX defines _POSIX_THREADS > 0 for pthread support,
       // however some platforms define _POSIX_THREADS without
       // a value, hence the (_POSIX_THREADS+0 >= 0) check.
-      // Strictly speeking this may catch platforms with a
+      // Strictly speaking this may catch platforms with a
       // non-functioning stub <pthreads.h>, but such occurrences should
-      // occur very rarely if at all...
+      // occur very rarely if at all.
 #     if defined(_POSIX_THREADS) && (_POSIX_THREADS+0 >= 0)
 #        define BOOST_HAS_PTHREADS
 #     endif