diff --git a/tutorials/shaders/shader_reference/shading_language.rst b/tutorials/shaders/shader_reference/shading_language.rst
index e63bfccef23..3982f6149f6 100644
--- a/tutorials/shaders/shader_reference/shading_language.rst
+++ b/tutorials/shaders/shader_reference/shading_language.rst
@@ -1018,6 +1018,10 @@ Per-instance uniforms
 
     Per-instance uniforms are only available in ``spatial`` (3D) shaders.
 
+.. note::
+
+    Per-instance uniforms are not supported when using the Compatibility renderer.
+
 Sometimes, you want to modify a parameter on each node using the material. As an
 example, in a forest full of trees, when you want each tree to have a slightly
 different color that is editable by hand. Without per-instance uniforms, this