diff --git a/doc/testplans/pbr_terrain_composition.md b/doc/testplans/pbr_terrain_composition.md
index 127fe950a8039324640ba0391a0064a77e16a149..524583aa7aa7279cabe7f0e44de274262114a65b 100644
--- a/doc/testplans/pbr_terrain_composition.md
+++ b/doc/testplans/pbr_terrain_composition.md
@@ -29,6 +29,8 @@ When the Region/Estate floater is opened to the terrain Tab, the current terrain
 - If it is texture terrain, the "PBR Metallic Roughness" checkbox should be unchecked, and the floater should display the four textures applied to the terrain.
 - If it is material terrain, the "PBR Metallic Roughness" checkbox should be checked, and the floater should display the four materials applied to the terrain.
 
+In addition, where possible, textual labels and descriptions in the tab should make sense given the current value of the "PBR Metallic Roughness" checkbox. If the checkbox is unchecked, the labels should refer to textures. If the checkbox is checked, the labels should refer to materials.
+
 ### Toggling Composition Type
 
 When toggling the "PBR Metallic Roughness" checkbox to the opposite value, which does not correspond to the current terrain type, one of the following sets of four terrain swatches will be displayed: