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+---
+summary: Presence deduplication module
+...
+
+This module tries to squash incoming identical presence stanzas to save
+some bandwith at the cost of increased memory use.
+
+Configuration
+=============
+
+  Option                         Type     Default
+  ------------------------------ -------- ---------
+  presence\_dedup\_cache\_size   number   `100`
+
+The only setting controls how many presence stanzas *per session* are
+kept in memory for comparing with incoming presenece.
+
+Requires Prosody 0.10 or later.