diff --git a/TODO.md b/TODO.md
index 3e201f7e..629972ed 100644
--- a/TODO.md
+++ b/TODO.md
@@ -28,9 +28,9 @@ notes to self
 - explicitly document label position at top-left corner
 - mark that uiControlShow() on a uiWindow() will bring to front and give keyboard focus because of OS X
 	- make sure ShowWindow() is sufficient for zorder on Windows
-- document that you CAN use InsertBefore functions to insert at the first invalid index, even if the array is empty
+- document that you CAN use InsertAt functions to insert at the first invalid index, even if the array is empty
 	- add tests for this
-- note that uiTabInsertPageBefore() does NOT change the current tab page (it may change its index if inserting before the current page)
+- note that uiTabInsertAt() does NOT change the current tab page (it may change its index if inserting before the current page)
 - note that the default action for uiWindowOnClosing() is to return 0 (keep the window open)
 - note that uiInitOptions should be initialized to zero
 - explicitly document that uiCheckboxSetChecked() and uiEntrySetText() do not fire uiCheckboxOnToggled() and uiEntryOnChanged(), respectively
diff --git a/redo/ptrarray.c b/redo/ptrarray.c
index b8abc8dd..06acdec9 100644
--- a/redo/ptrarray.c
+++ b/redo/ptrarray.c
@@ -21,13 +21,13 @@ void ptrArrayDestroy(struct ptrArray *p)
 
 void ptrArrayAppend(struct ptrArray *p, void *d)
 {
-	ptrArrayInsertBefore(p, p->len, d);
+	ptrArrayInsertAt(p, p->len, d);
 }
 
-void ptrArrayInsertBefore(struct ptrArray *p, uintmax_t i, void *d)
+void ptrArrayInsertAt(struct ptrArray *p, uintmax_t i, void *d)
 {
 	if (i > p->len)
-		complain("index out of range in ptrArrayInsertBefore()");
+		complain("index out of range in ptrArrayInsertAt()");
 	if (p->len >= p->cap) {
 		p->cap += grow;
 		p->ptrs = (void **) uiRealloc(p->ptrs, p->cap * sizeof (void *), "void *[]");
diff --git a/redo/test/page2.c b/redo/test/page2.c
index e64dfde6..23b77cac 100644
--- a/redo/test/page2.c
+++ b/redo/test/page2.c
@@ -26,7 +26,7 @@ static void movePage1(uiButton *b, void *data)
 {
 	if (moveBack) {
 		uiBoxDelete(mainBox, 1);
-		uiTabInsertBefore(mainTab, "Page 1", 0, uiControl(page1));
+		uiTabInsertAt(mainTab, "Page 1", 0, uiControl(page1));
 		uiButtonSetText(b, moveOutText);
 		moveBack = 0;
 		return;
diff --git a/redo/ui.idl b/redo/ui.idl
index e589c35c..16075415 100644
--- a/redo/ui.idl
+++ b/redo/ui.idl
@@ -124,7 +124,7 @@ func NewLabel(text *const char) *Label;
 
 interface Tab from Control {
 	func Append(name *const char, c *Control);
-	func InsertBefore(name *const char, before uintmax_t, c *Control);
+	func InsertAt(name *const char, before uintmax_t, c *Control);
 	func Delete(index uintmax_t);
 	func NumPages(void) uintmax_t;
 	func Margined(page uintmax_t) int;
diff --git a/redo/uipriv.h b/redo/uipriv.h
index 93cbb086..66462db4 100644
--- a/redo/uipriv.h
+++ b/redo/uipriv.h
@@ -19,7 +19,7 @@ struct ptrArray {
 struct ptrArray *newPtrArray(void);
 void ptrArrayDestroy(struct ptrArray *);
 void ptrArrayAppend(struct ptrArray *, void *);
-void ptrArrayInsertBefore(struct ptrArray *, uintmax_t, void *);
+void ptrArrayInsertAt(struct ptrArray *, uintmax_t, void *);
 void ptrArrayDelete(struct ptrArray *, uintmax_t);
 #define ptrArrayIndex(p, T, i) ((T) ((p)->ptrs[(i)]))
 
diff --git a/redo/windows/OLDtab.c b/redo/windows/OLDtab.c
index 15dc6424..9768fd4a 100644
--- a/redo/windows/OLDtab.c
+++ b/redo/windows/OLDtab.c
@@ -252,7 +252,7 @@ static void tabAppend(uiTab *tt, const char *name, uiControl *child)
 	uiControlQueueResize(page->control);
 }
 
-static void tabInsertBefore(uiTab *tt, const char *name, uintmax_t n, uiControl *child)
+static void tabInsertAt(uiTab *tt, const char *name, uintmax_t n, uiControl *child)
 {
 	struct tab *t = (struct tab *) tt;
 	TCITEMW item;
@@ -266,14 +266,14 @@ static void tabInsertBefore(uiTab *tt, const char *name, uintmax_t n, uiControl
 	// always hide; the current tab doesn't change
 	uiControlHide(page->control);
 
-	ptrArrayInsertBefore(t->pages, n, page);
+	ptrArrayInsertAt(t->pages, n, page);
 
 	ZeroMemory(&item, sizeof (TCITEMW));
 	item.mask = TCIF_TEXT;
 	wname = toUTF16(name);
 	item.pszText = wname;
 	if (SendMessageW(t->hwnd, TCM_INSERTITEM, (WPARAM) n, (LPARAM) (&item)) == (LRESULT) -1)
-		logLastError("error adding tab to Tab in uiTabInsertBefore()");
+		logLastError("error adding tab to Tab in uiTabInsertAt()");
 	uiFree(wname);
 }
 
@@ -363,7 +363,7 @@ uiTab *uiNewTab(void)
 	uiControl(t)->SysFunc = tabSysFunc;
 
 	uiTab(t)->Append = tabAppend;
-	uiTab(t)->InsertBefore = tabInsertBefore;
+	uiTab(t)->InsertAt = tabInsertAt;
 	uiTab(t)->Delete = tabDelete;
 	uiTab(t)->NumPages = tabNumPages;
 	uiTab(t)->Margined = tabMargined;
diff --git a/redo/windows/tab.c b/redo/windows/tab.c
index 1523cc69..b47e2d2a 100644
--- a/redo/windows/tab.c
+++ b/redo/windows/tab.c
@@ -30,7 +30,7 @@ static void tabAppend(uiTab *tt, const char *name, uiControl *child)
 {
 }
 
-static void tabInsertBefore(uiTab *tt, const char *name, uintmax_t n, uiControl *child)
+static void tabInsertAt(uiTab *tt, const char *name, uintmax_t n, uiControl *child)
 {
 }
 
@@ -78,7 +78,7 @@ uiTab *uiNewTab(void)
 	uiControl(t)->PreferredSize = tabPreferredSize;
 
 	uiTab(t)->Append = tabAppend;
-	uiTab(t)->InsertBefore = tabInsertBefore;
+	uiTab(t)->InsertAt = tabInsertAt;
 	uiTab(t)->Delete = tabDelete;
 	uiTab(t)->NumPages = tabNumPages;
 	uiTab(t)->Margined = tabMargined;