diff --git a/config.default.yaml b/config.default.yaml
index a20e4d04..d97f4712 100755
--- a/config.default.yaml
+++ b/config.default.yaml
@@ -112,7 +112,10 @@ renewable:
       method: wind
       turbine: NREL_ReferenceTurbine_5MW_offshore
     capacity_per_sqkm: 3
-    # correction_factor: 0.93
+    correction_factor: 0.8855
+    # proxy for wake losses
+    # from 10.1016/j.energy.2018.08.153
+    # until done more rigorously in #153
     corine: [44, 255]
     natura: true
     max_depth: 50
@@ -126,7 +129,10 @@ renewable:
       turbine: NREL_ReferenceTurbine_5MW_offshore
     # ScholzPhd Tab 4.3.1: 10MW/km^2
     capacity_per_sqkm: 3
-    # correction_factor: 0.93
+    correction_factor: 0.8855
+    # proxy for wake losses
+    # from 10.1016/j.energy.2018.08.153
+    # until done more rigorously in #153
     corine: [44, 255]
     natura: true
     max_depth: 50
diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index ec57778b..22406954 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -11,7 +11,9 @@ Release Notes
 Upcoming Release
 ================
 
-* add new features and bugfixes here
+* Add an efficiency factor of 88.55% to offshore wind capacity factors
+  as a proxy for wake losses. More rigorous modelling is `planned <https://github.com/PyPSA/pypsa-eur/issues/153>`_
+  [`#277 <https://github.com/PyPSA/pypsa-eur/pull/277>`_].
 
 
 PyPSA-Eur 0.4.0 (22th September 2021)