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-rw-r--r--Documentation/public-inbox-index.pod1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/public-inbox-index.pod b/Documentation/public-inbox-index.pod
index 398ac516..8a37580c 100644
--- 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