diff --git a/README.md b/README.md
index f4e3662..22deb92 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ These are the variables you're likely to want to change.  They are defined in [p
 | gpu_clock_min          | Sets the minimum (dynamic) GPU clock (in `Mhz`) for the non-default `amdgpu` profiles                                                                                                                                                                                                                                                                 | `700`                                                                                                                                                    |
 | gpu_clock_max          | Sets the maximum (dynamic) GPU clock (in `MHz`) for the non-default `amdgpu` profiles                                                                                                                                                                                                                                                                 | `2600`, results in `2.6GHz` (rounded); mild overclock                                                                                                                     |
 | gpumem_clock_static       | Sets the _static_ memory clock for the GPU (in `MHz`).  This is *not* the _effective_ data rate.  That is a multiple of this depending on the type of VRAM.<br/><br/>To avoid flickering this does *not* change dynamically with load.                                                                                                                | `1050`, results in just over `1GHz`; mild overclock<br/><br/>Actual effective clock depends on this being multiplied against the data/pump rate of the `GDDR?` GPU memory                                                                                                                                  |
-| gpu_mv_offset          | GPU core voltage offset.  Takes +/- some integer in millivolts.  Can be used to both over _and_ under volt.                                                                                                                                                                                                                                | `-10` (undervolt `10mV` or `0.01V`)                                                                                                                                     |
+| gpu_mv_offset          | GPU core voltage offset.  Takes +/- some integer in millivolts.  Can be used to both over _and_ under volt.                                                                                                                                                                                                                                | `-50` (undervolt `50mV` or `0.05V`)                                                                                                                                     |
 | base_profiles          | List of base tuned profiles to clone in the new AMDGPU profiles.  Defaults based on `Fedora`                                                                                                                                                                                                                                               | <ul><li>`balanced`</li><li>`desktop`</li><li>`latency-performance`</li><li>`network-latency`</li><li>`network-throughput`</li><li>`powersave`</li><li>`virtual-host`</li>|
 | amdgpu_profiles        | Dictionary mapping the AMDGPU power profiles found in `/sys/class/drm/card*/device/pp_power_profile_mode` and custom power limits.<br/><br>For each item, two keys: `pwrmode` and `pwr_cap_multi`.<br/><br/>`pwrmode` maps to the number assigned in `/sys` above.<br/>`pwr_cap_multi` is a multiplier against board power capability. Must be a float, eg: `0.5` for *50%* | <pre>default:<br/>  pwrmode: 0<br/>  pwr_cap_multi: 0.75<br/>  # 75% relatively safe default<br/>VR:<br/>  pwrmode: 4<br/>  pwr_cap_multi: 0.8<br/>  # 80%, likely slight boost<br/>custom:<br/>  pwrmode: 6<br/>  pwr_cap_multi: 1.0<br/>  # 100%, full GPU board capability<br/>  # warning: significantly increased heat</pre>|
 
diff --git a/playbook.yml b/playbook.yml
index afeb9cb..76d2f95 100644
--- a/playbook.yml
+++ b/playbook.yml
@@ -10,9 +10,9 @@
       gpu_clock_min: "750" # default 500
       gpu_clock_max: "2600" # default 2529
       gpumem_clock_static: "1050"
-      # optional, applies offset (+/-) to GPU voltage
-      gpu_mv_offset: "-10"
-      # boosts GPU core voltage 100mV or 0.1V. for the 'custom' GPU profile.
+      # optional, applies offset (+/-) to GPU voltage by provided mV
+      gpu_mv_offset: "-50"
+      # '-50' undervolts GPU core voltage 50mV or 0.05V
       #
       # list of source tuned profiles available on Fedora (TODO: should dynamically discover)
       base_profiles: