diff --git a/doc/classes/OmniLight.xml b/doc/classes/OmniLight.xml
index 6722b7543..658039227 100644
--- a/doc/classes/OmniLight.xml
+++ b/doc/classes/OmniLight.xml
@@ -23,7 +23,9 @@
 			See [enum ShadowDetail].
 		</member>
 		<member name="omni_shadow_mode" type="int" setter="set_shadow_mode" getter="get_shadow_mode" enum="OmniLight.ShadowMode" default="1">
-			See [enum ShadowMode].
+			The shadow rendering mode to use for this [OmniLight]. See [enum ShadowMode].
+			[b]Note:[/b] In GLES2, [constant SHADOW_CUBE] is only supported on GPUs that feature support for depth cubemaps. Old GPUs such as the Radeon HD 4000 series don't support cubemap shadows and will fall back to dual paraboloid shadows as a result.
+		</member>
 		</member>
 	</members>
 	<constants>
diff --git a/drivers/gles2/rasterizer_storage_gles2.cpp b/drivers/gles2/rasterizer_storage_gles2.cpp
index ef3d9f0e1..ca67648b2 100644
--- a/drivers/gles2/rasterizer_storage_gles2.cpp
+++ b/drivers/gles2/rasterizer_storage_gles2.cpp
@@ -6032,6 +6032,10 @@ void RasterizerStorageGLES2::initialize() {
 	//picky requirements for these
 	config.support_shadow_cubemaps = config.support_depth_texture && config.support_write_depth && config.support_depth_cubemaps;
 
+	if (!config.support_shadow_cubemaps) {
+		print_verbose("OmniLight cubemap shadows are not supported by this GPU. Falling back to dual paraboloid shadows for all omni lights (faster but less precise).");
+	}
+
 	frame.count = 0;
 	frame.delta = 0;
 	frame.current_rt = nullptr;