diff --git a/core/src/processing/core/PGraphics.java b/core/src/processing/core/PGraphics.java
index dc47a2c6c..8ec72c89d 100644
--- a/core/src/processing/core/PGraphics.java
+++ b/core/src/processing/core/PGraphics.java
@@ -1224,6 +1224,9 @@ public class PGraphics extends PImage implements PConstants {
    * @see PGraphics#textureWrap(int)
    */
   public void textureMode(int mode) {
+    if (mode != IMAGE && mode != NORMAL) {
+      throw new RuntimeException("textureMode() only supports IMAGE and NORMAL");
+    }
     this.textureMode = mode;
   }
 
diff --git a/core/todo.txt b/core/todo.txt
index 329e82178..43fcad9c1 100644
--- a/core/todo.txt
+++ b/core/todo.txt
@@ -36,6 +36,8 @@ 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
+X throw an error for textureMode(REPEAT) [fry]
+X   https://github.com/processing/processing/issues/2052
 
 _ Sort out blending differences with P2D/P3D
 _   https://github.com/processing/processing/issues/1844