diff --git a/README.md b/README.md
index 0417f94..6cef251 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,7 @@ DrawString(s string, x, y float64)
 DrawStringAnchored(s string, x, y, ax, ay float64)
 DrawStringWrapped(s string, x, y, ax, ay, width, lineSpacing float64, align Align)
 MeasureString(s string) (w, h float64)
+MeasureMultilineString(s string, lineSpacing float64) (w, h float64)
 WordWrap(s string, w float64) []string
 SetFontFace(fontFace font.Face)
 LoadFontFace(path string, points float64) error
@@ -173,6 +174,9 @@ defined using paths.
 Clip()
 ClipPreserve()
 ResetClip()
+AsMask() *image.Alpha
+SetMask(mask *image.Alpha)
+InvertMask()
 ```
 
 ## Helper Functions