diff --git a/db.go b/db.go
index 4da4540..275c4f5 100644
--- a/db.go
+++ b/db.go
@@ -115,7 +115,7 @@ func (db *DB) mmap() error {
 	info, err := db.file.Stat()
 	if err != nil {
 		return &Error{"mmap stat error", err}
-	} else if int(info.Size()) < db.pageSize * 2 {
+	} else if int(info.Size()) < db.pageSize*2 {
 		return &Error{"file size too small", err}
 	}
 	size := int(info.Size())
diff --git a/db_test.go b/db_test.go
index a68f64d..20ed51c 100644
--- a/db_test.go
+++ b/db_test.go
@@ -145,7 +145,6 @@ func TestDBCorruptMeta0(t *testing.T) {
 	})
 }
 
-
 //--------------------------------------
 // Transaction()
 //--------------------------------------
diff --git a/rwtransaction.go b/rwtransaction.go
index 9ecd4ee..14aceb9 100644
--- a/rwtransaction.go
+++ b/rwtransaction.go
@@ -8,7 +8,7 @@ import (
 // Only one read/write transaction can be active for a DB at a time.
 type RWTransaction struct {
 	Transaction
-	mpages map[pgid]*mpage
+	tpages map[pgid]*tpage
 }
 
 // TODO: Allocate scratch meta page.
@@ -61,7 +61,7 @@ func (t *RWTransaction) CreateBucket(name string) error {
 	// Insert new node.
 	c := t.sys.cursor()
 	c.Goto([]byte(name))
-	t.mpage(c.page().id).put([]byte(name), buf[:])
+	t.tpage(c.page().id).put([]byte(name), buf[:])
 
 	return nil
 }
@@ -104,7 +104,7 @@ func (t *RWTransaction) Put(name string, key []byte, value []byte) error {
 	// Insert a new node.
 	c := b.cursor()
 	c.Goto(key)
-	t.mpage(c.page().id).put(key, value)
+	t.tpage(c.page().id).put(key, value)
 
 	return nil
 }
@@ -124,18 +124,18 @@ func (t *RWTransaction) allocate(size int) (*page, error) {
 	return nil, nil
 }
 
-// mpage returns a deserialized leaf page.
-func (t *RWTransaction) mpage(id pgid) *mpage {
-	if t.mpages != nil {
-		if p := t.mpages[id]; p != nil {
+// tpage returns a deserialized leaf page.
+func (t *RWTransaction) tpage(id pgid) *tpage {
+	if t.tpages != nil {
+		if p := t.tpages[id]; p != nil {
 			return p
 		}
 	}
 
 	// Read raw page and deserialize.
-	p := &mpage{}
+	p := &tpage{}
 	p.read(t.page(id))
-	t.mpages[id] = p
+	t.tpages[id] = p
 
 	return p
 }
diff --git a/mnode.go b/tnode.go
similarity index 52%
rename from mnode.go
rename to tnode.go
index 1d0abca..fcb4782 100644
--- a/mnode.go
+++ b/tnode.go
@@ -1,9 +1,8 @@
 package bolt
 
-type mnodes []mnode
+type tnodes []tnode
 
-type mnode struct {
+type tnode struct {
 	key   []byte
 	value []byte
 }
-
diff --git a/mpage.go b/tpage.go
similarity index 82%
rename from mpage.go
rename to tpage.go
index 7c5e048..c4dc83f 100644
--- a/mpage.go
+++ b/tpage.go
@@ -6,23 +6,25 @@ import (
 	"unsafe"
 )
 
-// mpage represents a deserialized leaf page.
+// tpage represents a temporary, in-memory leaf page.
 // It is deserialized from an memory-mapped page and is not restricted by page size.
-type mpage struct {
-	nodes mnodes
+type tpage struct {
+	nodes tnodes
 }
 
 // allocator is a function that returns a set of contiguous pages.
 type allocator func(count int) (*page, error)
 
 // put inserts or replaces a key on a leaf page.
-func (p *mpage) put(key []byte, value []byte) {
+func (p *tpage) put(key []byte, value []byte) {
 	// Find insertion index.
 	index := sort.Search(len(p.nodes), func(i int) bool { return bytes.Compare(p.nodes[i].key, key) != -1 })
 
 	// If there is no existing key then add a new node.
-	if len(p.nodes) == 0 || !bytes.Equal(p.nodes[index].key, key) {
-		p.nodes = append(p.nodes, mnode{})
+	if index == len(p.nodes) {
+		p.nodes = append(p.nodes, tnode{})
+	} else if len(p.nodes) == 0 || !bytes.Equal(p.nodes[index].key, key) {
+		p.nodes = append(p.nodes, tnode{})
 		copy(p.nodes[index+1:], p.nodes[index:])
 	}
 	p.nodes[index].key = key
@@ -30,8 +32,8 @@ func (p *mpage) put(key []byte, value []byte) {
 }
 
 // read initializes the node data from an on-disk page.
-func (p *mpage) read(page *page) {
-	p.nodes = make(mnodes, page.count)
+func (p *tpage) read(page *page) {
+	p.nodes = make(tnodes, page.count)
 	lnodes := (*[maxNodesPerPage]lnode)(unsafe.Pointer(&page.ptr))
 	for i := 0; i < int(page.count); i++ {
 		lnode := lnodes[i]
@@ -42,7 +44,7 @@ func (p *mpage) read(page *page) {
 }
 
 // write writes the nodes onto one or more leaf pages.
-func (p *mpage) write(pageSize int, allocate allocator) ([]*page, error) {
+func (p *tpage) write(pageSize int, allocate allocator) ([]*page, error) {
 	var pages []*page
 
 	for _, nodes := range p.split(pageSize) {
@@ -84,10 +86,10 @@ func (p *mpage) write(pageSize int, allocate allocator) ([]*page, error) {
 }
 
 // split divides up the noes in the page into appropriately sized groups.
-func (p *mpage) split(pageSize int) []mnodes {
+func (p *tpage) split(pageSize int) []tnodes {
 	// If we only have enough nodes for one page then just return the nodes.
 	if len(p.nodes) <= minKeysPerPage {
-		return []mnodes{p.nodes}
+		return []tnodes{p.nodes}
 	}
 
 	// If we're not larger than one page then just return the nodes.
@@ -96,13 +98,13 @@ func (p *mpage) split(pageSize int) []mnodes {
 		totalSize += lnodeSize + len(node.key) + len(node.value)
 	}
 	if totalSize < pageSize {
-		return []mnodes{p.nodes}
+		return []tnodes{p.nodes}
 	}
 
 	// Otherwise group into smaller pages and target a given fill size.
 	var size int
-	var group mnodes
-	var groups []mnodes
+	var group tnodes
+	var groups []tnodes
 
 	// Set fill threshold to 25%.
 	threshold := pageSize >> 4
@@ -113,7 +115,7 @@ func (p *mpage) split(pageSize int) []mnodes {
 		// TODO(benbjohnson): Don't create a new group for just the last node.
 		if group == nil || (len(group) > minKeysPerPage && size+nodeSize > threshold) {
 			size = pageHeaderSize
-			group = make(mnodes, 0)
+			group = make(tnodes, 0)
 			groups = append(groups, group)
 		}
 
diff --git a/tpage_test.go b/tpage_test.go
new file mode 100644
index 0000000..d14ebdb
--- /dev/null
+++ b/tpage_test.go
@@ -0,0 +1,35 @@
+package bolt
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// Ensure that a temporary page can insert a key/value.
+func TestTpagePut(t *testing.T) {
+	p := &tpage{nodes: make(tnodes, 0)}
+	p.put([]byte("baz"), []byte("2"))
+	p.put([]byte("foo"), []byte("0"))
+	p.put([]byte("bar"), []byte("1"))
+	p.put([]byte("foo"), []byte("3"))
+	assert.Equal(t, len(p.nodes), 3)
+	assert.Equal(t, p.nodes[0], tnode{[]byte("bar"), []byte("1")})
+	assert.Equal(t, p.nodes[1], tnode{[]byte("baz"), []byte("2")})
+	assert.Equal(t, p.nodes[2], tnode{[]byte("foo"), []byte("3")})
+}
+
+// Ensure that a temporary page can deserialize from a page.
+func TestTpageRead(t *testing.T) {
+	t.Skip("pending")
+}
+
+// Ensure that a temporary page can serialize itself.
+func TestTpageWrite(t *testing.T) {
+	t.Skip("pending")
+}
+
+// Ensure that a temporary page can split into appropriate subgroups.
+func TestTpageSplit(t *testing.T) {
+	t.Skip("pending")
+}