# Increase Liquidity (v3) (/docs/protocols/v3/guides/managing-liquidity/increase-liquidity)

Increase an existing Uniswap v3 position using PositionManager while preserving the position range.

## Increase Liquidity Within the Current Range
Make sure to go through the [first guide](/docs/protocols/v3/guides/managing-liquidity/getting-started) before continuing to this section

* This example assumes the contract already has custody of the NFT.

* We cannot change the boundaries of a given liquidity position using the Uniswap v3 protocol; `increaseLiquidity` can only increase the liquidity of a position.

* In production, `amount0Min` and `amount1Min` should be adjusted to create slippage protections.

```solidity
    /// @notice Increases liquidity in the current range
    /// @dev Pool must be initialized already to add liquidity
    /// @param tokenId The id of the erc721 token
    /// @param amount0 The amount to add of token0
    /// @param amount1 The amount to add of token1
    function increaseLiquidityCurrentRange(
        uint256 tokenId,
        uint256 amountAdd0,
        uint256 amountAdd1
    )
        external
        returns (
            uint128 liquidity,
            uint256 amount0,
            uint256 amount1
        )
    {
        INonfungiblePositionManager.IncreaseLiquidityParams memory params =
            INonfungiblePositionManager.IncreaseLiquidityParams({
                tokenId: tokenId,
                amount0Desired: amountAdd0,
                amount1Desired: amountAdd1,
                amount0Min: 0,
                amount1Min: 0,
                deadline: block.timestamp
            });

        (liquidity, amount0, amount1) = nonfungiblePositionManager.increaseLiquidity(params);
    }
```