diff --git a/manimlib/shaders/inserts/get_xy_to_uv.glsl b/manimlib/shaders/inserts/get_xy_to_uv.glsl
index 643eeefc..15c1702b 100644
--- a/manimlib/shaders/inserts/get_xy_to_uv.glsl
+++ b/manimlib/shaders/inserts/get_xy_to_uv.glsl
@@ -67,9 +67,9 @@ mat3 get_xy_to_uv(vec2 controls[3], float temp_is_linear, out float is_linear){
     */
     vec2[2] dest;
     is_linear = temp_is_linear;
-    // Portions of the parabola y = x^2 where x exceeds this value are just
-    // treated as straight lines.
-    float thresh = 2.0;  
+    // Portions of the parabola y = x^2 where abs(x) exceeds
+    // this value are treated as straight lines.
+    float thresh = 2.0;
     if (!bool(is_linear)){
         vec2 xs = xs_on_clean_parabola(controls);
         float x0 = xs.x;