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-rw-r--r--doc/lib.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/lib.rst b/doc/lib.rst
index b43f295ef..ea43c0db9 100644
--- a/doc/lib.rst
+++ b/doc/lib.rst
@@ -84,7 +84,7 @@ Collections and algorithms
   Efficient implementation of a set of ints as a sparse bit set.
 * `critbits <critbits.html>`_
   This module implements a *crit bit tree* which is an efficient
-  container for a set or a mapping of strings.
+  container for a sorted set of strings, or for a sorted mapping of strings.
 * `sequtils <sequtils.html>`_
   This module implements operations for the built-in seq type
   which were inspired by functional programming languages.