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+This command is exactly like `GEORADIUS` with the sole difference that instead
+of taking, as the center of the area to query, a longitude and latitude value,
+it takes the name of a member already existing inside the geospatial index
+represented by the sorted set.
+
+The position of the specified member is used as the center of the query.
+
+Please check the example below and the `GEORADIUS` documentation for more
+information about the command and its options.
+
+Note that `GEORADIUSBYMEMBER_RO` is also available since Redis 3.2.10 and Redis
+4.0.0 in order to provide a read-only command that can be used in replicas. See
+the `GEORADIUS` page for more information.
+
+@examples
+
+```cli
+GEOADD Sicily 13.583333 37.316667 "Agrigento"
+GEOADD Sicily 13.361389 38.115556 "Palermo" 15.087269 37.502669 "Catania"
+GEORADIUSBYMEMBER Sicily Agrigento 100 km
+```