diff --git a/YPCheatSheet.tex b/YPCheatSheet.tex
index c55ae20..1aa62c3 100644
--- a/YPCheatSheet.tex
+++ b/YPCheatSheet.tex
@@ -197,9 +197,9 @@ \section{Symbols}
 $\mathtt{EMPTY}(\boldsymbol{\sigma}, a)$ & An account $a$ is \textit{empty} when it has no code, zero nonce and zero balance, $\boldsymbol{\sigma}[a]_c = \texttt{\small KEC}\big(()\big) \wedge \boldsymbol{\sigma}[a]_n = 0 \wedge \boldsymbol{\sigma}[a]_b = 0$. \\
 $\mathtt{DEAD}(\boldsymbol{\sigma}, a)$ & An account $a$ is \textit{dead} when its account state is non-existent or empty: $\varnothing \vee \mathtt{EMPTY}(\boldsymbol{\sigma}, a)$. \\
 $\mathtt{TRIE}$ & The root hash of the Merkle Patricia tree constructed from its arguments. \\
-$\mathtt{KEC}$ & TODO \\
-$\mathtt{RLP}$ & TODO \\
-$\mathtt{PoW}$ & TODO \\
+$\mathtt{KEC}$ & Keccak-256 hash function. \\
+$\mathtt{RLP}$ & Recursive Length Prefix function. A serialization method for encoding arbitrarily structured binary data (byte arrays). \\
+$\mathtt{PoW}$ & Proof of Work function. \\
 
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