diff --git a/example/wallet/wallet.sol b/example/wallet/wallet.sol
index 9881c385..5c7d9c84 100644
--- a/example/wallet/wallet.sol
+++ b/example/wallet/wallet.sol
@@ -13,7 +13,7 @@ pragma solidity ^0.4.10;
 
 contract multiowned {
 
-	// TYPES
+    // TYPES
 
     // struct for the status of a pending operation.
     struct PendingState {
@@ -22,7 +22,7 @@ contract multiowned {
         uint index;
     }
 
-	// EVENTS
+    // EVENTS
 
     // this contract only has six types of events: it can accept a confirmation, in which case
     // we record owner and operation (hash) alongside it.
@@ -35,7 +35,7 @@ contract multiowned {
     // the last one is emitted if the required signatures change
     event RequirementChanged(uint newRequirement);
 
-	// MODIFIERS
+    // MODIFIERS
 
     // simple single-sig function modifier.
     modifier onlyowner {
@@ -50,7 +50,7 @@ contract multiowned {
         _;
     }
 
-	// METHODS
+    // METHODS
 
     // constructor is given number of sigs required to do protected "onlymanyowners" transactions
     // as well as the selection of addresses capable of confirming them.
@@ -131,7 +131,7 @@ contract multiowned {
         return address(m_owners[ownerIndex + 1]);
     }
 
-    function isOwner(address _addr) returns (bool) {
+    function isOwner(address _addr) constant returns (bool) {
         return m_ownerIndex[_addr] > 0;
     }
 
@@ -211,7 +211,7 @@ contract multiowned {
         delete m_pendingIndex;
     }
 
-   	// FIELDS
+    // FIELDS
 
     // the number of owners that must confirm the same operation before it is run.
     uint public m_required;
@@ -233,7 +233,7 @@ contract multiowned {
 // uses is specified in the modifier.
 contract daylimit is multiowned {
 
-	// MODIFIERS
+    // MODIFIERS
 
     // simple modifier for daily limit.
     modifier limitedDaily(uint _value) {
@@ -241,7 +241,7 @@ contract daylimit is multiowned {
         _;
     }
 
-	// METHODS
+    // METHODS
 
     // constructor - stores initial daily limit and records the present day's index.
     function daylimit(uint _limit) {
@@ -278,7 +278,7 @@ contract daylimit is multiowned {
     // determines today's index.
     function today() private constant returns (uint) { return now / 1 days; }
 
-	// FIELDS
+    // FIELDS
 
     uint public m_dailyLimit;
     uint public m_spentToday;
@@ -288,7 +288,7 @@ contract daylimit is multiowned {
 // interface contract for multisig proxy contracts; see below for docs.
 contract multisig {
 
-	// EVENTS
+    // EVENTS
 
     // logged events:
     // Funds has arrived into the wallet (record how much).
@@ -313,7 +313,7 @@ contract multisig {
 // Wallet(w).from(anotherOwner).confirm(h);
 contract Wallet is multisig, multiowned, daylimit {
 
-	// TYPES
+    // TYPES
 
     // Transaction structure to remember details of transaction lest it need be saved for a later call.
     struct Transaction {
@@ -384,7 +384,7 @@ contract Wallet is multisig, multiowned, daylimit {
         super.clearPending();
     }
 
-	// FIELDS
+    // FIELDS
 
     // pending transactions we have at present.
     mapping (bytes32 => Transaction) m_txs;