diff --git a/docs/source/release/v5.1.0/framework.rst b/docs/source/release/v5.1.0/framework.rst
index 769cda42cb59e2d06b749aaad5edaf333b6a5b3f..43fc0d4d23dad87972606c602e4396c41a669d95 100644
--- a/docs/source/release/v5.1.0/framework.rst
+++ b/docs/source/release/v5.1.0/framework.rst
@@ -18,6 +18,7 @@ Algorithms
 - Add specialization to :ref:`SetUncertainties <algm-SetUncertainties>` for the
    case where InputWorkspace == OutputWorkspace. Where possible, avoid the
    cost of cloning the inputWorkspace.
+- Adjusted :ref:`AddPeak <algm-AddPeak>` to only allow peaks from the same instrument as the peaks worksapce to be added to that workspace. 
 
 Data Handling
 -------------