Fix the math in the description of the unit interval.

diff --git a/dss.ggo b/dss.ggo
index d843906bf718906944fa46bd5e22687f9e14149a..7892d530c3a689a1edb665e84d6f9472f387884c 100644 (file)
--- a/dss.ggo
+++ b/dss.ggo
@@ -214,13 +214,14 @@ details="
        unit intervals.
 
        dss removes any snapshots older than n times u and tries to
-       keep 2^(k-1) snapshots in interval k, where the interval number
-       k counts from zero, zero being the most recent unit interval.
+       keep 2^(n - k - 1) snapshots in interval k, where the interval
+       number k counts from zero, zero being the most recent unit
+       interval.
 
        In other words, the oldest snapshot will at most be u * n days
        (= 20 days if default values are used) old.  Moreover, there
        are at most 2^n - 1 snapshots in total (i. e. 31 by default).
-       Observe that you have to create at least 2 ^ (n - 1) snapshots
+       Observe that you have to create at least 2^(n - 1) snapshots
        each interval for this to work out because that is the number
        of snapshots in interval zero.
 "