diff --git a/doc/unit-tests.txt b/doc/unit-tests.txt
index 671ec3e7198..9bc4cfa44b0 100644
--- a/doc/unit-tests.txt
+++ b/doc/unit-tests.txt
@@ -12,7 +12,7 @@ make -f makefile.unix test_bitcoin  # Replace makefile.unix if you're not on uni
 If all tests succeed the last line of output will be:
 *** No errors detected
 
-To add more tests, add BOOST_AUTO_TEST_CASE's to the existing
+To add more tests, add BOOST_AUTO_TEST_CASE functions to the existing
 .cpp files in the test/ directory or add new .cpp files that
-implement new BOOST_AUTO_TEST_SUITE's (and add them to the
+implement new BOOST_AUTO_TEST_SUITE sections (and add them to the
 list of includes in test_bitcoin.cpp).
diff --git a/src/main.cpp b/src/main.cpp
index 0e6830e4654..c06eb888874 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -469,7 +469,7 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
 
         // Continuously rate-limit free transactions
         // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
-        // be annoying or make other's transactions take longer to confirm.
+        // be annoying or make others' transactions take longer to confirm.
         if (nFees < MIN_RELAY_TX_FEE)
         {
             static CCriticalSection cs;
@@ -957,7 +957,7 @@ bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTes
         }
     }
 
-    // Make sure all prevout.n's are valid:
+    // Make sure all prevout.n indexes are valid:
     for (unsigned int i = 0; i < vin.size(); i++)
     {
         const COutPoint prevout = vin[i].prevout;
@@ -1192,7 +1192,7 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
     // being sent to another address.
     // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
     // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
-    // already refuses previously-known transaction id's entirely.
+    // already refuses previously-known transaction ids entirely.
     // This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
     // On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
     if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
diff --git a/src/main.h b/src/main.h
index 5357413cdc5..13931d077a7 100644
--- a/src/main.h
+++ b/src/main.h
@@ -564,7 +564,7 @@ public:
             if (nBlockSize == 1)
             {
                 // Transactions under 10K are free
-                // (about 4500bc if made of 50bc inputs)
+                // (about 4500 BTC if made of 50 BTC inputs)
                 if (nBytes < 10000)
                     nMinFee = 0;
             }
diff --git a/src/script.cpp b/src/script.cpp
index d9101fbdeb0..3b9d6c8db5a 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -1269,7 +1269,7 @@ int CScript::GetSigOpCount(const CScript& scriptSig) const
             return 0;
     }
 
-    /// ... and return it's opcount:
+    /// ... and return its opcount:
     CScript subscript(data.begin(), data.end());
     return subscript.GetSigOpCount(true);
 }
diff --git a/src/util.cpp b/src/util.cpp
index c70b9d9e6ec..d496a44d2d4 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -352,7 +352,7 @@ string FormatMoney(int64 n, bool fPlus)
     int64 remainder = n_abs%COIN;
     string str = strprintf("%"PRI64d".%08"PRI64d, quotient, remainder);
 
-    // Right-trim excess 0's before the decimal point:
+    // Right-trim excess zeros before the decimal point:
     int nTrim = 0;
     for (int i = str.size()-1; (str[i] == '0' && isdigit(str[i-2])); --i)
         ++nTrim;