Documenting.

README.md

@@ -15,11 +15,11 @@ Currently we support the following datasest:
 - **Swissprot** - Protein sequence data in XML.
 
 The details about each dataset can be found in the README files in the
-datasets subdirectories.
+corresponding subdirectories.
 
 ## Statistics
 
-The `statistics` subdirectory contains scripts to summirize the data. The table
+The `statistics` subdirectory contains scripts to summarize the data. The table
 below shows the statistics of our datasets.
 
 Dataset   | Number of trees | Avg. tree size | Min tree size | Max tree size | Number of distinct labels
@@ -34,6 +34,19 @@ Swissprot | 556196          | 862            | 101           | 48286         | 1
 
 Each dataset and its corresponding scripts belong to a separate directory with a name identifying the dataset.
 
+There is a script `download_prepare.sh` for each dataset, that downloads the
+raw data, converts to bracket notation, and sorts by tree size.
+
+The `utilities` directory holds tools common for multiple datasets.
+
+## RAM requirements and runtime estimates
+
+For each dataset, if necessary, we list the required RAM memory and estimated
+runtime. The RAM requirements go up to **60GB** for the Swissprot dataset.
+
+The script `utilities/sort_dataset.sh` has a hard-coded 10GB buffer size.
+However, it executes on machines with less RAM too.
+
 ## Expected output
 
 Each output dataset must satisfy the following requirements: