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@@ -41,7 +41,9 @@ limitations under the License.
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 - (id) find:(NuBlock *) block;
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 /*! Iterate over each member of a collection, applying the provided block to each member, and returning an array of the results. */
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 - (NSArray *) map:(NuBlock *) block;
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-/*! Iterate over each member of a collection, using the provided block to combine members into a single return value. */
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+/*! Iterate over each member of a collection, using the provided block to combine members into a single return value. 
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+    The block is expected to take two arguments: the accumulated return value followed by the collection member.
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+*/
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 - (id) reduce:(NuBlock *) block from:(id) initial;
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 /*! Iterate over each member of a collection, applying the provided selector to each member, and returning an array of the results. */
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 - (NSArray *) mapSelector:(SEL) selector;