diff --git a/openrpc/src/methods/getHealth.json b/openrpc/src/methods/getHealth.json
index bcd27f681..3dbe4d382 100644
--- a/openrpc/src/methods/getHealth.json
+++ b/openrpc/src/methods/getHealth.json
@@ -26,7 +26,7 @@
                 },
                 "ledgerRetentionWindow": {
                     "type": "number",
-                    "description": "Maximum retention window configured. A full window state can be determined via: ledgerRetentionWindow -1 <= latestLedger - oldestLedger"
+                    "description": "Maximum retention window configured. A full window state can be determined via: ledgerRetentionWindow = latestLedger - oldestLedger + 1"
                 }
             }
         }