diff --git a/README b/README
index e7963ff..778989a 100644
--- a/README
+++ b/README
@@ -70,8 +70,8 @@ NOTES
    Aging:
        The rank of directories maintained by z undergoes aging based on a sim-
        ple formula. The rank of each entry is incremented  every  time  it  is
-       accessed.  When  the  sum  of ranks is greater than 6000, all ranks are
-       multiplied by 0.99. Entries with a rank lower than 1 are forgotten.
+       accessed.  When the sum of ranks is over 9000, all ranks are multiplied
+       by 0.99. Entries with a rank lower than 1 are forgotten.
 
    Frecency:
        Frecency is a portmanteau of 'recent' and 'frequency'. It is a weighted
diff --git a/z.1 b/z.1
index 5cbf20d..bba9d78 100644
--- a/z.1
+++ b/z.1
@@ -96,8 +96,8 @@ Install the provided man page \fBz.1\fR somewhere like \fB/usr/local/man/man1\fR
 Aging:
 The rank of directories maintained by \fBz\fR undergoes aging based on a simple
 formula. The rank of each entry is incremented every time it is accessed. When
-the sum of ranks is greater than 6000, all ranks are multiplied by 0.99. Entries
-with a rank lower than 1 are forgotten.
+the sum of ranks is over 9000, all ranks are multiplied by 0.99. Entries with a
+rank lower than 1 are forgotten.
 .SS
 Frecency:
 Frecency is a portmanteau of 'recent' and 'frequency'. It is a weighted rank
diff --git a/z.sh b/z.sh
index 132904e..a8c6a89 100644
--- a/z.sh
+++ b/z.sh
@@ -69,7 +69,7 @@ _z() {
                 count += $2
             }
             END {
-                if( count > 6000 ) {
+                if( count > 9000 ) {
                     # aging
                     for( x in rank ) print x "|" 0.99*rank[x] "|" time[x]
                 } else for( x in rank ) print x "|" rank[x] "|" time[x]