diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 4c0edb4e892..efc69a4e43e 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -2243,7 +2243,7 @@ void ThreadRPCServer2(void* parg)
     }
     catch(boost::system::system_error &e)
     {
-        ThreadSafeMessageBox(strprintf(_("An error occured while setting up the RPC port %i for listening: %s"), endpoint.port(), e.what()),
+        ThreadSafeMessageBox(strprintf(_("An error occurred while setting up the RPC port %i for listening: %s"), endpoint.port(), e.what()),
                              _("Error"), wxOK | wxMODAL);
         StartShutdown();
         return;
diff --git a/src/init.cpp b/src/init.cpp
index 31e2ce6bdec..172e66a27ad 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -78,7 +78,7 @@ void Shutdown(void* parg)
         printf("Bitcoin exiting\n\n");
         fExit = true;
 #ifndef QT_GUI
-        // ensure non UI client get's exited here, but let Bitcoin-Qt reach return 0; in bitcoin.cpp
+        // ensure non-UI client get's exited here, but let Bitcoin-Qt reach return 0; in bitcoin.cpp
         exit(0);
 #endif
     }
diff --git a/src/key.h b/src/key.h
index 4dc4914bdc1..eb54c3e98f5 100644
--- a/src/key.h
+++ b/src/key.h
@@ -78,7 +78,7 @@ err:
 
 // Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
 // recid selects which key is recovered
-// if check is nonzero, additional checks are performed
+// if check is non-zero, additional checks are performed
 int static inline ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
 {
     if (!eckey) return 0;
diff --git a/src/keystore.h b/src/keystore.h
index 87c84010d89..027c98a54d2 100644
--- a/src/keystore.h
+++ b/src/keystore.h
@@ -23,7 +23,7 @@ public:
     virtual bool HaveKey(const CBitcoinAddress &address) const =0;
 
     // Retrieve a key corresponding to a given address from the store.
-    // Return true if succesful.
+    // Return true if successful.
     virtual bool GetKey(const CBitcoinAddress &address, CKey& keyOut) const =0;
 
     // Retrieve only the public key corresponding to a given address.
diff --git a/src/net.h b/src/net.h
index 96e3680d380..622c02c3253 100644
--- a/src/net.h
+++ b/src/net.h
@@ -125,7 +125,7 @@ protected:
     int nRefCount;
 
     // Denial-of-service detection/prevention
-    // Key is ip address, value is banned-until-time
+    // Key is IP address, value is banned-until-time
     static std::map<unsigned int, int64> setBanned;
     static CCriticalSection cs_setBanned;
     int nMisbehavior;
diff --git a/src/qt/askpassphrasedialog.cpp b/src/qt/askpassphrasedialog.cpp
index e96f41941cf..2126edf0b22 100644
--- a/src/qt/askpassphrasedialog.cpp
+++ b/src/qt/askpassphrasedialog.cpp
@@ -178,7 +178,7 @@ void AskPassphraseDialog::accept()
 
 void AskPassphraseDialog::textChanged()
 {
-    // Validate input, set Ok button to enabled when accepable
+    // Validate input, set Ok button to enabled when acceptable
     bool acceptable = false;
     switch(mode)
     {
diff --git a/src/qt/bitcoinaddressvalidator.cpp b/src/qt/bitcoinaddressvalidator.cpp
index c804ad0d576..f1cc2aaa27b 100644
--- a/src/qt/bitcoinaddressvalidator.cpp
+++ b/src/qt/bitcoinaddressvalidator.cpp
@@ -5,8 +5,8 @@
 
   This is:
   - All numbers except for '0'
-  - All uppercase letters except for 'I' and 'O'
-  - All lowercase letters except for 'l'
+  - All upper-case letters except for 'I' and 'O'
+  - All lower-case letters except for 'l'
 
   User friendly Base58 input can map
   - 'l' and 'I' to '1'
diff --git a/src/qt/bitcoinamountfield.h b/src/qt/bitcoinamountfield.h
index ead8bdb84ba..ca4a888e4ec 100644
--- a/src/qt/bitcoinamountfield.h
+++ b/src/qt/bitcoinamountfield.h
@@ -40,7 +40,7 @@ signals:
     void textChanged();
 
 protected:
-    /** Intercept focus-in event and ',' keypresses */
+    /** Intercept focus-in event and ',' key presses */
     bool eventFilter(QObject *object, QEvent *event);
 
 private:
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index c36dd216d41..f8e75174315 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -150,7 +150,7 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
     // Clicking on a transaction on the overview page simply sends you to transaction history page
     connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), this, SLOT(gotoHistoryPage()));
 
-    // Doubleclicking on a transaction on the transaction history page shows details
+    // Double-clicking on a transaction on the transaction history page shows details
     connect(transactionView, SIGNAL(doubleClicked(QModelIndex)), transactionView, SLOT(showDetails()));
 
     gotoOverviewPage();
@@ -335,7 +335,7 @@ void BitcoinGUI::setWalletModel(WalletModel *walletModel)
         setEncryptionStatus(walletModel->getEncryptionStatus());
         connect(walletModel, SIGNAL(encryptionStatusChanged(int)), this, SLOT(setEncryptionStatus(int)));
 
-        // Balloon popup for new transaction
+        // Balloon pop-up for new transaction
         connect(walletModel->getTransactionTableModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                 this, SLOT(incomingTransaction(QModelIndex,int,int)));
 
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 0fcb72a3eec..313aa06c589 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -92,7 +92,7 @@ private:
 
     /** Create the main UI actions. */
     void createActions();
-    /** Create the menu bar and submenus. */
+    /** Create the menu bar and sub-menus. */
     void createMenuBar();
     /** Create the toolbars */
     void createToolBars();
@@ -153,7 +153,7 @@ private slots:
     void encryptWallet(bool status);
     /** Change encrypted wallet passphrase */
     void changePassphrase();
-    /** Ask for pass phrase to unlock wallet temporarily */
+    /** Ask for passphrase to unlock wallet temporarily */
     void unlockWallet();
 };
 
diff --git a/src/qt/bitcoinunits.h b/src/qt/bitcoinunits.h
index 18fa36a0b7b..9b7c9e160e9 100644
--- a/src/qt/bitcoinunits.h
+++ b/src/qt/bitcoinunits.h
@@ -5,7 +5,7 @@
 #include <QAbstractListModel>
 
 /** Bitcoin unit definitions. Encapsulates parsing and formatting
-   and serves as list model for dropdown selection boxes.
+   and serves as list model for drop-down selection boxes.
 */
 class BitcoinUnits: public QAbstractListModel
 {
@@ -26,7 +26,7 @@ public:
     //! Unit conversion and formatting
     ///@{
 
-    //! Get list of units, for dropdown box
+    //! Get list of units, for drop-down box
     static QList<Unit> availableUnits();
     //! Is unit ID valid?
     static bool valid(int unit);
@@ -49,7 +49,7 @@ public:
     ///@}
 
     //! @name AbstractListModel implementation
-    //! List model for unit dropdown selection box.
+    //! List model for unit drop-down selection box.
     ///@{
     enum RoleIndex {
         /** Unit identifier */
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index f5e6e0a545f..eeba74b1752 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -80,7 +80,7 @@ bool GUIUtil::parseBitcoinURI(QString uri, SendCoinsRecipient *out)
     // Convert bitcoin:// to bitcoin:
     //
     //    Cannot handle this later, because bitcoin:// will cause Qt to see the part after // as host,
-    //    which will lowercase it (and thus invalidate the address).
+    //    which will lower-case it (and thus invalidate the address).
     if(uri.startsWith("bitcoin://"))
     {
         uri.replace(0, 10, "bitcoin:");
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index ef57e017b43..703156bc438 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -33,7 +33,7 @@ public:
     static bool parseBitcoinURI(const QUrl *, SendCoinsRecipient *out);
     static bool parseBitcoinURI(QString uri, SendCoinsRecipient *out);
 
-    /** Get save file name, mimics QFileDialog::getSaveFileName, except that it appends a default suffix
+    /** Get save filename, mimics QFileDialog::getSaveFileName, except that it appends a default suffix
         when no suffix is provided by the user.
 
       @param[in] parent  Parent window (or 0)
diff --git a/src/qt/notificator.cpp b/src/qt/notificator.cpp
index e668079536e..c1c177dbfed 100644
--- a/src/qt/notificator.cpp
+++ b/src/qt/notificator.cpp
@@ -82,7 +82,7 @@ public:
 
     static int metaType();
 
-    // Image to variant that can be marshaled over DBus
+    // Image to variant that can be marshalled over DBus
     static QVariant toVariant(const QImage &img);
 
 private:
@@ -294,7 +294,7 @@ void Notificator::notify(Class cls, const QString &title, const QString &text, c
     default:
         if(cls == Critical)
         {
-            // Fall back to old fashioned popup dialog if critical and no other notification available
+            // Fall back to old fashioned pop-up dialog if critical and no other notification available
             QMessageBox::critical(parent, title, text, QMessageBox::Ok, QMessageBox::Ok);
         }
         break;
diff --git a/src/qt/notificator.h b/src/qt/notificator.h
index 0271c26f484..8abc0b2ec28 100644
--- a/src/qt/notificator.h
+++ b/src/qt/notificator.h
@@ -27,7 +27,7 @@ public:
     {
         Information,         /**< Informational message */
         Warning,             /**< Notify user of potential problem */
-        Critical             /**< An error occured */
+        Critical             /**< An error occurred */
     };
 
 public slots:
diff --git a/src/qt/transactionfilterproxy.h b/src/qt/transactionfilterproxy.h
index 8d6829d6f09..30b98588f02 100644
--- a/src/qt/transactionfilterproxy.h
+++ b/src/qt/transactionfilterproxy.h
@@ -23,7 +23,7 @@ public:
     void setDateRange(const QDateTime &from, const QDateTime &to);
     void setAddressPrefix(const QString &addrPrefix);
     /**
-      @note Type filter takes a bitfield created with TYPE() or ALL_TYPES
+      @note Type filter takes a bit field created with TYPE() or ALL_TYPES
      */
     void setTypeFilter(quint32 modes);
     void setMinAmount(qint64 minimum);
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index b5b3792f8e3..5f53241662d 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -205,7 +205,7 @@ void TransactionView::chooseDate(int idx)
                 TransactionFilterProxy::MAX_DATE);
         break;
     case ThisWeek: {
-        // Find last monday
+        // Find last Monday
         QDate startOfWeek = current.addDays(-(current.dayOfWeek()-1));
         transactionProxyModel->setDateRange(
                 QDateTime(startOfWeek),
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
index 01e6691254a..b395326711d 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -20,7 +20,7 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
     CNode dummyNode1(INVALID_SOCKET, addr1, true);
     dummyNode1.Misbehaving(100); // Should get banned
     BOOST_CHECK(CNode::IsBanned(addr1.ip));
-    BOOST_CHECK(!CNode::IsBanned(addr1.ip|0x0000ff00)); // Different ip, not banned
+    BOOST_CHECK(!CNode::IsBanned(addr1.ip|0x0000ff00)); // Different IP, not banned
 
     CAddress addr2(0xa0b0c002);
     CNode dummyNode2(INVALID_SOCKET, addr2, true);