diff --git a/core/src/processing/core/PGraphics.java b/core/src/processing/core/PGraphics.java
index 037ae6fa8..dc47a2c6c 100644
--- a/core/src/processing/core/PGraphics.java
+++ b/core/src/processing/core/PGraphics.java
@@ -7635,6 +7635,9 @@ public class PGraphics extends PImage implements PConstants {
    * individual color components of a color supplied as an int value.
    */
   static public int lerpColor(int c1, int c2, float amt, int mode) {
+    if (amt < 0) amt = 0;
+    if (amt > 1) amt = 1;
+
     if (mode == RGB) {
       float a1 = ((c1 >> 24) & 0xff);
       float r1 = (c1 >> 16) & 0xff;
diff --git a/core/todo.txt b/core/todo.txt
index fd4b3fc53..41f5106fe 100644
--- a/core/todo.txt
+++ b/core/todo.txt
@@ -14,6 +14,10 @@ X fix image transparency in PDF output
 X   https://github.com/processing/processing/pull/2070
 X Java2D images crash after being resized
 X   https://github.com/processing/processing/issues/2113
+X constrain lerpColor() between 0 and 1
+
+_ JSONObject/Array.format(-1) not working on embedded JSONObjects
+_   https://github.com/processing/processing/issues/2119
 
 opengl
 X fix inconsistency with P2D and resetMatrix()
@@ -28,6 +32,8 @@ X push/popStyle() causes color problems with P2D/P3D
 X   https://github.com/processing/processing/issues/2102
 X child SVG elements misplaced when rendering with P2D/P3D
 X   https://github.com/processing/processing/issues/2086
+X SUBTRACT and DIFFERENCE blend modes are swapped
+X   https://github.com/processing/processing/issues/2075
 
 _ Sort out blending differences with P2D/P3D
 _   https://github.com/processing/processing/issues/1844