diff --git a/README.md b/README.md
index dd6ea52..5e2a434 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ This library uses the compiled circuits generated by the jaz compiler.
 
 ## Install.
 
-```
+```sh
 npm install zksnark
 ```
 
@@ -16,13 +16,13 @@ npm install zksnark
 
 ### Import.
 
-```
+```js
 const zkSnark = require("zksnark");
 ```
 
 ### Load a circuit.
 
-```
+```js
 // "myCircuit.cir" is the output of the jaz compiler
 
 const circuitDef = JSON.parse(fs.readFileSync("myCircuit.cir", "utf8"));
@@ -31,7 +31,7 @@ const circuit = new zkSnark.Circuit(circuitDef);
 
 ### Inspect the circuit.
 
-```
+```js
     // `signalId` can always be a number or an alias string
 
     circuit.nConstraints; // number of constraints
@@ -77,7 +77,7 @@ const circuit = new zkSnark.Circuit(circuitDef);
 
 ### Trusted setup.
 
-```
+```js
 const setup = zkSnark.setup(circuit);
 fs.writeFileSink("myCircuit.vk_proof", JSON.stringify(setup.vk_proof), "utf8");
 fs.writeFileSink("myCircuit.vk_verifier", JSON.stringify(setup.vk_verifier), "utf8");
@@ -86,7 +86,7 @@ setup.toxic  // Must be discarded.
 
 ### Generate proof.
 
-```
+```js
 const circuitDef = JSON.parse(fs.readFileSync("myCircuit.cir", "utf8"));
 const circuit = new zkSnark.Circuit(circuitDef);
 const input = {
@@ -101,7 +101,7 @@ const {proof, publicSignals} = zkSnark.genProof(vk_proof, witness);
 
 ### Verifier.
 
-```
+```js
 const vk_verifier = JSON.parse(fs.readFileSync("myCircuit.vk_verifier", "utf8"));
 
 if (zkSnark.isValid(vk_verifier, proof, publicSignals)) {