diff --git a/sdk/cosmos/azure-cosmos/CHANGELOG.md b/sdk/cosmos/azure-cosmos/CHANGELOG.md
index 19ff1ace1e95..2d71505c4b3a 100644
--- a/sdk/cosmos/azure-cosmos/CHANGELOG.md
+++ b/sdk/cosmos/azure-cosmos/CHANGELOG.md
@@ -7,6 +7,7 @@
 #### Breaking Changes
 
 #### Bugs Fixed
+* Fixed an issue where change feed with `startFrom` point-in-time returned `400` on merged partitions by enabling the `CHANGE_FEED_WITH_START_TIME_POST_MERGE` SDK capability.
 
 #### Other Changes
 
diff --git a/sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/HttpConstants.java b/sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/HttpConstants.java
index 1d2f96316fcf..7eef40c6f689 100644
--- a/sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/HttpConstants.java
+++ b/sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/HttpConstants.java
@@ -316,7 +316,7 @@ public static class SDKSupportedCapabilities {
         public static final String SUPPORTED_CAPABILITIES;
         public static final String SUPPORTED_CAPABILITIES_NONE;
         static {
-            SUPPORTED_CAPABILITIES = String.valueOf(PARTITION_MERGE);
+            SUPPORTED_CAPABILITIES = String.valueOf(PARTITION_MERGE | CHANGE_FEED_WITH_START_TIME_POST_MERGE);
             SUPPORTED_CAPABILITIES_NONE = String.valueOf(NONE);
         }
     }