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-rw-r--r--lib/pure/collections/critbits.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/pure/collections/critbits.nim b/lib/pure/collections/critbits.nim
index bb234565b..519c58653 100644
--- a/lib/pure/collections/critbits.nim
+++ b/lib/pure/collections/critbits.nim
@@ -8,8 +8,9 @@
 #
 
 ## This module implements a `crit bit tree`:idx: which is an efficient
-## container for a set or a mapping of strings. Based on the excellent paper
+## container for a sorted set of strings, or for a sorted mapping of strings. Based on the excellent paper
 ## by Adam Langley.
+## (A crit bit tree is a form of `radix tree`:idx: or `patricia trie`:idx:.)
 
 include "system/inclrtl"