diff --git a/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl
index 31544cf212b5dec4e8d6ed3ab26fe9565b8cba93..a6b09ad3ad0b19c6eb221a9dad38592989327432 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/multiSpotLightF.glsl
@@ -44,7 +44,7 @@ uniform sampler2DRect emissiveRect; // PBR linear packed Occlusion, Roughness, M
 uniform samplerCube environmentMap;
 uniform sampler2DRect lightMap;
 uniform sampler2D noiseMap;
-uniform sampler2D projectionMap;
+uniform sampler2D projectionMap; // rgba
 uniform sampler2D lightFunc;
 
 uniform mat4 proj_mat; //screen space to light space
diff --git a/indra/newview/app_settings/shaders/class3/deferred/spotLightF.glsl b/indra/newview/app_settings/shaders/class3/deferred/spotLightF.glsl
index 7a2cb84f6eeb221cbef2bd68efce47cd70ae1156..e49963899123340773fc78c7c23322d54ff928b5 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/spotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/spotLightF.glsl
@@ -44,7 +44,7 @@ uniform sampler2DRect emissiveRect; // PBR linear packed Occlusion, Roughness, M
 uniform samplerCube environmentMap;
 uniform sampler2DRect lightMap;
 uniform sampler2D noiseMap;
-uniform sampler2D projectionMap;
+uniform sampler2D projectionMap; // rgba
 uniform sampler2D lightFunc;
 
 uniform mat4 proj_mat; //screen space to light space