Fix formatting
diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst
index f3ac55b..2a472fe 100644
--- a/Doc/library/signal.rst
+++ b/Doc/library/signal.rst
@@ -238,13 +238,13 @@
The behavior of the call is dependent on the value of *how*, as follows.
- * :data:`SIG_BLOCK`: The set of blocked signals is the union of the current
- set and the *mask* argument.
- * :data:`SIG_UNBLOCK`: The signals in *mask* are removed from the current
- set of blocked signals. It is permissible to attempt to unblock a
- signal which is not blocked.
- * :data:`SIG_SETMASK`: The set of blocked signals is set to the *mask*
- argument.
+ * :data:`SIG_BLOCK`: The set of blocked signals is the union of the current
+ set and the *mask* argument.
+ * :data:`SIG_UNBLOCK`: The signals in *mask* are removed from the current
+ set of blocked signals. It is permissible to attempt to unblock a
+ signal which is not blocked.
+ * :data:`SIG_SETMASK`: The set of blocked signals is set to the *mask*
+ argument.
*mask* is a set of signal numbers (e.g. {:const:`signal.SIGINT`,
:const:`signal.SIGTERM`}). Use ``range(1, signal.NSIG)`` for a full mask