diff --git a/doc/man/man5/slapd-config.5 b/doc/man/man5/slapd-config.5
index 5e3b4bfd815c0501544e2025e29f6d30b9e3161a..96aeffd4c81bb19fcd206b1839ee4b58d5d0543e 100644
--- a/doc/man/man5/slapd-config.5
+++ b/doc/man/man5/slapd-config.5
@@ -456,7 +456,8 @@ feature.  The default is 0.
 .B olcIndexIntLen: <integer>
 Specify the key length for ordered integer indices. The most significant
 bytes of the binary integer will be used for index keys. The default
-value is 4, which provides exact indexing for 32 bit values.
+value is 4, which provides exact indexing for 31 bit values.
+A floating point representation is used to index too large values.
 .TP
 .B olcIndexSubstrIfMaxlen: <integer>
 Specify the maximum length for subinitial and subfinal indices. Only
diff --git a/doc/man/man5/slapd.conf.5 b/doc/man/man5/slapd.conf.5
index 6bc5b5812733f1e201ebbe137dc04742a9c84492..c20df8b68843995a87787ee37d7c9d03d7d04f15 100644
--- a/doc/man/man5/slapd.conf.5
+++ b/doc/man/man5/slapd.conf.5
@@ -473,7 +473,8 @@ continuing with the next line of the current file.
 .B index_intlen <integer>
 Specify the key length for ordered integer indices. The most significant
 bytes of the binary integer will be used for index keys. The default
-value is 4, which provides exact indexing for 32 bit values.
+value is 4, which provides exact indexing for 31 bit values.
+A floating point representation is used to index too large values.
 .TP
 .B index_substr_if_minlen <integer>
 Specify the minimum length for subinitial and subfinal indices. An