diff --git a/doc/src/usage.rst b/doc/src/usage.rst
index f7ffd691..1da8572f 100644
--- a/doc/src/usage.rst
+++ b/doc/src/usage.rst
@@ -532,7 +532,7 @@ rounded to the nearest minute, with an error of up to 30 seconds.
 
 
 .. index::
-    double: Date Objects, Infinite
+    double: Date objects; Infinite
 
 .. _infinite-dates-handling: