diff --git a/Lib/fontTools/ttLib/tables/_g_l_y_f.py b/Lib/fontTools/ttLib/tables/_g_l_y_f.py
index 68bdeca52..154d4b799 100644
--- a/Lib/fontTools/ttLib/tables/_g_l_y_f.py
+++ b/Lib/fontTools/ttLib/tables/_g_l_y_f.py
@@ -362,9 +362,9 @@ class table__g_l_y_f(DefaultTable.DefaultTable):
 		"coord" is an array of GlyphCoordinates which must include the four
 		"phantom points".
 
-		Only the horizontal advance and sidebearings in "hmtx" table are updated
-		from the first two phantom points. The last two phantom points for
-		vertical typesetting are currently ignored.
+		Both the horizontal/vertical advances and left/top sidebearings in "hmtx"
+		and "vmtx" tables (if any) are updated from four phantom points and
+		the glyph's bounding boxes.
 		"""
 		# TODO: Create new glyph if not already present
 		assert glyphName in self.glyphs
@@ -400,9 +400,15 @@ class table__g_l_y_f(DefaultTable.DefaultTable):
 			# https://github.com/fonttools/fonttools/pull/1198
 			horizontalAdvanceWidth = 0
 		leftSideBearing = otRound(glyph.xMin - leftSideX)
-		# TODO Handle vertical metrics?
 		ttFont["hmtx"].metrics[glyphName] = horizontalAdvanceWidth, leftSideBearing
 
+		if "vmtx" in ttFont:
+			verticalAdvanceWidth = otRound(topSideY - bottomSideY)
+			if verticalAdvanceWidth < 0:  # unlikely but do the same as horizontal
+				verticalAdvanceWidth = 0
+			topSideBearing = otRound(topSideY - glyph.yMax)
+			ttFont["vmtx"].metrics[glyphName] = verticalAdvanceWidth, topSideBearing
+
 
 _GlyphControls = namedtuple(
 	"_GlyphControls", "numberOfContours endPts flags components"