doc: note some changes for 1.5

[public-inbox.git] / Documentation / public-inbox-index.pod

diff --git a/Documentation/public-inbox-index.pod b/Documentation/public-inbox-index.pod
index 398ac516bf9c729ff595cc0d810749faa85091df..8a37580c01eabe08f16f397ec38e7d5b4fe4dbc0 100644 (file)
--- a/Documentation/public-inbox-index.pod
+++ b/Documentation/public-inbox-index.pod
@@ -94,6 +94,7 @@ supported, thus the value of C<1m> to prevents indexing of
 messages larger than one megabyte.
 
 This is useful for avoiding memory exhaustion in mirrors.
+This option is only available in public-inbox 1.5 or later.
 
 Default: none