diff --git a/README.md b/README.md
index 75f2149..4b3c1c5 100644
--- a/README.md
+++ b/README.md
@@ -48,13 +48,19 @@ Note: `BBIFile.schema['dtypes']` provides numpy data types for the fields in a b
 
 ### Interval output
 
-The actual intervals in a bigWig or bigBed can be retrieved as a pandas dataframe or as an iterator over records as tuples. The pandas output is parsed according to the file's schema.
+The actual interval records in a bigWig or bigBed can be retrieved as a pandas dataframe or as an iterator over records as tuples. The pandas output is parsed according to the file's schema.
 
 ```
 BBIFile.fetch_intervals(chrom, start, end) -> pandas.DataFrame
 BBIFile.fetch_intervals(chrom, start, end, iterator=True) -> interval iterator
 ```
 
+Summary bin records at each zoom level are also accessible.
+
+```
+BBIFile.fetch_summaries(chrom, start, end, zoom) -> pandas.DataFrame
+```
+
 ### Array output
 
 Retrieve quantitative signal as an array. The signal of a bigWig file is obtained from its "value" field. The signal of a bigBed file is obtained from the genomic coverage of its intervals.