diff --git a/README.md b/README.md
index e8fe415..a0c8fac 100644
--- a/README.md
+++ b/README.md
@@ -21,11 +21,13 @@ However, [multicall.py](https://github.com/banteg/multicall.py) is built on [asy
 
 This implementation fixes that.
 
-# Multicall Smart Contract
+# W3Multicall
+
+## Multicall Smart Contract
 [Multicall](https://github.com/mds1/multicall) smart contract are deployed on numerous chains and can help reduce the strain
 put on RPC by order of magnitude by *batching* multiple requests into a single one.
 
-# Simple Multicall
+## Simple Multicall
 
 ```
 from web3 import Web3
@@ -49,7 +51,7 @@ print("Vitalik holds {:.2f} USDC".format(results[0]/10**6))
 
 [See full example](/examples/simple_multicall.py)
 
-# Multithread Multicall
+## Multithread Multicall
 
 ```
 w3_pool = W3Pool([
diff --git a/pyproject.toml b/pyproject.toml
index fff6869..3110b1b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "w3multicall"
 description = "Python interface and utilities for Solidity multicall contract"
 authors = [{name = "Ortis", email = "ortis@ortis.io"}]
-version = "0.1.1"
+version = "0.1.2"
 readme = "README.md"
 keywords = ["blockchain", "web3", "etherum", "solidity"]
 license = {file = "LICENSE"}
diff --git a/setup.cfg b/setup.cfg
index aa8804a..3fbe52f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = w3multicall
-version = 0.1.1
+version = 0.1.2
 author = Ortis
 author_email = ortis@ortis.io
 description = Python interface and utilities for Solidity multicall contract
diff --git a/src/w3multicall/multicall.py b/src/w3multicall/multicall.py
index d2f13a7..3d468f1 100644
--- a/src/w3multicall/multicall.py
+++ b/src/w3multicall/multicall.py
@@ -112,6 +112,11 @@ class W3Multicall:
 
     class Call:
         def __init__(self, address: str, signature: str, args=None):
+            """
+            :param address: address of the contract to call
+            :param signature: method signature to call (no space. Example: 'balanceOf(address)(uint256)')
+            :param args: arguments of the contract method to call (use python tuple for solidity struct, python list for solidity arrays and python int for solidity uint/int)
+            """
             self.address = address
             self.signature = signature.replace(" ", "")
 
diff --git a/src/w3multicall/threading/w3multicall_executor.py b/src/w3multicall/threading/w3multicall_executor.py
index 0d31a9f..836aec9 100644
--- a/src/w3multicall/threading/w3multicall_executor.py
+++ b/src/w3multicall/threading/w3multicall_executor.py
@@ -12,14 +12,15 @@
 
 class W3:
 
-    def __init__(self, w3: Web3, delay_between_call: float):
+    def __init__(self, w3: Web3, delay_between_call: float, label: Union[str, None] = None):
         self.w3 = w3
         self.delay_between_call = delay_between_call
         self.limit_rate_per_seconds = 1 / self.delay_between_call
         self.last_call_at = 0
+        self.label = str(self) if label is None else label
 
     def __repr__(self):
-        return '{} {:.2f}/s'.format(self.w3, self.limit_rate_per_seconds)
+        return '{} {:.2f}/s'.format(self.label, self.limit_rate_per_seconds)
 
     def use(self) -> Web3:
         self.last_call_at = time.time()