diff --git a/frontend/ui/uimanager.lua b/frontend/ui/uimanager.lua
index 5300389d7..6ef99e215 100644
--- a/frontend/ui/uimanager.lua
+++ b/frontend/ui/uimanager.lua
@@ -24,6 +24,10 @@ local WAVEFORM_MODE_DU4         = 0x7    -- Medium fidelity 4 level of gray dire
 -- Kindle PW2
 local WAVEFORM_MODE_REAGL       = 0x8    -- Ghost compensation waveform
 local WAVEFORM_MODE_REAGLD      = 0x9    -- Ghost compensation waveform with dithering
+-- Kindle Basic/Kindle Voyage
+local WAVEFORM_MODE_GL4         = 0xA    -- 2-bit from white transition
+-- TODO: Use me in night mode on those devices!
+local WAVEFORM_MODE_GL16_INV    = 0xB    -- High fidelity for black transition
 
 local WAVEFORM_MODE_AUTO        = 0x101