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Add max storage value size info #2162

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1 change: 1 addition & 0 deletions content/md/en/docs/build/runtime-storage.md
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Expand Up @@ -98,6 +98,7 @@ You can use the FRAME storage data structures to read or write any value that ca
The storage module provides the following types of storage structures:

- [StorageValue](https://paritytech.github.io/substrate/master/frame_support/storage/trait.StorageValue.html) to store any single value, such as a `u64`.
- Note: As a rule of thumb you will want to avoid storing values over 16KiB under one key (see [here]([https://github.com/paritytech/substrate/pull/3126#issue-468524837](https://github.com/paritytech/substrate/issues/2966#issuecomment-510087309)) for the original analysis of effect on storage size on timings in RocksDb).
- [StorageMap](https://paritytech.github.io/substrate/master/frame_support/storage/trait.StorageMap.html) to store a single key to value mapping, such as a specific account key to a specific balance value.
- [StorageDoubleMap](https://paritytech.github.io/substrate/master/frame_support/storage/trait.StorageDoubleMap.html) to store values in a storage map with two keys as an optimization to efficiently remove all entries that have a common first key.
- [StorageNMap](https://paritytech.github.io/substrate/master/frame_support/storage/trait.StorageNMap.html) to store values in a map with any arbitrary number of keys.
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