- "Initiate a garbage collection. GEN may be provided for compatibility with
- generational garbage collectors, but is ignored in this implementation."
+ "Initiate a garbage collection.
+
+The collection is always a full collection.
+
+Arguments FULL and GEN can be used for compatibility with GENCGC
+platforms: there the default is to initiate a nursery collection,
+which may in turn trigger a collection of one or more older
+generations as well. If FULL is true, all generations are collected.
+If GEN is provided, it can be used to specify the oldest generation
+guaranteed to be collected."