diff --git a/draw/scale.go b/draw/scale.go
index 98ab404..3fc30c4 100644
--- a/draw/scale.go
+++ b/draw/scale.go
@@ -65,7 +65,7 @@
 	// the src image are drawn from.
 	//
 	// A dst or src mask image having a zero alpha (transparent) pixel value in
-	// the respective coordinate space means that that dst pixel is entirely
+	// the respective coordinate space means that dst pixel is entirely
 	// unaffected or that src pixel is considered transparent black. A full
 	// alpha (opaque) value means that the dst pixel is maximally affected or
 	// the src pixel contributes maximally. The default values, nil, are
diff --git a/tiff/reader.go b/tiff/reader.go
index 8a941c1..ce2ef71 100644
--- a/tiff/reader.go
+++ b/tiff/reader.go
@@ -110,7 +110,7 @@
 	return u, nil
 }
 
-// parseIFD decides whether the the IFD entry in p is "interesting" and
+// parseIFD decides whether the IFD entry in p is "interesting" and
 // stows away the data in the decoder. It returns the tag number of the
 // entry and an error, if any.
 func (d *decoder) parseIFD(p []byte) (int, error) {
diff --git a/vp8/decode.go b/vp8/decode.go
index 1bb5028..2aa9fee 100644
--- a/vp8/decode.go
+++ b/vp8/decode.go
@@ -82,7 +82,7 @@
 	pred [4]uint8
 	// nzMask is a mask of 8 bits: 4 for the bottom or right 4x4 luma regions,
 	// and 2 + 2 for the bottom or right 4x4 chroma regions. A 1 bit indicates
-	// that that region has non-zero coefficients.
+	// that region has non-zero coefficients.
 	nzMask uint8
 	// nzY16 is a 0/1 value that is 1 if the macroblock used Y16 prediction and
 	// had non-zero coefficients.
@@ -274,7 +274,7 @@
 	var partLens [maxNOP]int
 	d.nOP = 1 << d.fp.readUint(uniformProb, 2)
 
-	// The final partition length is implied by the the remaining chunk data
+	// The final partition length is implied by the remaining chunk data
 	// (d.r.n) and the other d.nOP-1 partition lengths. Those d.nOP-1 partition
 	// lengths are stored as 24-bit uints, i.e. up to 16 MiB per partition.
 	n := 3 * (d.nOP - 1)