Index: source/blender/makesrna/intern/rna_scene.c
===================================================================
--- source/blender/makesrna/intern/rna_scene.c	(revision 57788)
+++ source/blender/makesrna/intern/rna_scene.c	(working copy)
@@ -2232,7 +2232,7 @@
 	prop = RNA_def_property(srna, "layers", PROP_BOOLEAN, PROP_LAYER_MEMBER);
 	RNA_def_property_boolean_sdna(prop, NULL, "lay", 1);
 	RNA_def_property_array(prop, 20);
-	RNA_def_property_ui_text(prop, "Visible Layers", "Scene layers included in this render layer");
+	RNA_def_property_ui_text(prop, "Camera Layers", "objects on these layers are directly visible to the camera. When an object is in the scene layers but not camera layers, it will still cast shadows or be visible in reflections, so it's still indirectly visible");
 	if (scene) RNA_def_property_boolean_funcs(prop, NULL, "rna_SceneRenderLayer_layer_set");
 	else RNA_def_property_boolean_funcs(prop, NULL, "rna_RenderLayer_layer_set");
 	if (scene) RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_glsl_update");
@@ -5099,7 +5099,7 @@
 	RNA_def_property_boolean_sdna(prop, NULL, "lay", 1);
 	RNA_def_property_array(prop, 20);
 	RNA_def_property_boolean_funcs(prop, NULL, "rna_Scene_layer_set");
-	RNA_def_property_ui_text(prop, "Layers", "Visible layers - Shift-Click to select multiple layers");
+	RNA_def_property_ui_text(prop, "Layers", "Visible layers (shared between all renderlayers) - Shift-Click to select multiple layers");
 	RNA_def_property_update(prop, NC_SCENE | ND_LAYER, "rna_Scene_layer_update");
 
 	/* active layer */

--- /bin/2.67/scripts/addons/cycles/ui.py
+++ /bin/2.67/scripts/addons/cycles/ui.py
@@ -295,7 +295,7 @@
         col.prop(rl, "layers_exclude", text="Exclude")
 
         col = split.column()
-        col.prop(rl, "layers", text="Layer")
+        col.prop(rl, "layers", text="Camera Layer")
         col.prop(rl, "layers_zmask", text="Mask Layer")
 
         split = layout.split()