Update evm.rst

winsvega · Dec 22, 2017 · 79e7b04 · 79e7b04
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diff --git a/evm.rst b/evm.rst
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 0x40    BLOCKHASH
 	Get the hash of one of the 256 most recent complete blocks.
+	Where blockhash(number) is the hash of a block of a particular number, up to a maximum age.
+        0 is left on the stack if the looked for block number is greater than the current block number
+        or more than 256 blocks behind the current block.
 
 	Input Args
 		* value1 - block number (32 bytes)