--- a/doc/hg.1.txt
+++ b/doc/hg.1.txt
@@ -509,7 +509,7 @@ SPECIFYING MULTIPLE REVISIONS
     If BEGIN is greater than END, revisions are treated in reverse
     order.
 
-    A range acts as an open interval.  This means that a range of 3:5
+    A range acts as a closed interval.  This means that a range of 3:5
     gives 3, 4 and 5.  Similarly, a range of 4:2 gives 4, 3, and 2.
 
 ENVIRONMENT VARIABLES