diff --git a/src/sonic-yang-models/tests/yang_model_tests/tests/sonic-events-swss.json b/src/sonic-yang-models/tests/yang_model_tests/tests/sonic-events-swss.json
index 6592fd1013..56a05d1736 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/tests/sonic-events-swss.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/tests/sonic-events-swss.json
@@ -40,6 +40,9 @@
 	"SONIC_EVENTS_SWSS_PFC_STORM_VALID_WITH_ADDITIONAL_INFO": {
 		"desc": "VALID IF_STATE EVENT."
 	},
+	"SONIC_EVENTS_SWSS_PFC_STORM_VALID_WITH_ADDITIONAL_INFO_FRAGMENT": {
+		"desc": "VALID IF_STATE EVENT."
+	},
 	"SONIC_EVENTS_SWSS_PFC_STORM_WITH_INVALID_ADDITIONAL_INFO_1": {
 	    "desc": "PFC_STORM_EVENT_INCORRECT_ADDITIONAL_INFO failure.",
             "eStrKey": "Pattern"
diff --git a/src/sonic-yang-models/tests/yang_model_tests/tests_config/sonic-events-swss.json b/src/sonic-yang-models/tests/yang_model_tests/tests_config/sonic-events-swss.json
index e56acc0a47..919468dcbc 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/tests_config/sonic-events-swss.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/tests_config/sonic-events-swss.json
@@ -113,6 +113,18 @@
             }
         }
     },
+    "SONIC_EVENTS_SWSS_PFC_STORM_VALID_WITH_ADDITIONAL_INFO_FRAGMENT": {
+        "sonic-events-swss:sonic-events-swss": {
+            "sonic-events-swss:pfc-storm": {
+                "ifname": "Ethernet0",
+                "queue_index": 0,
+                "queue_id": 0,
+                "port_id": 0,
+                "additional_info": "info1:1.2|info2:3.25",
+                "timestamp": "1985-04-12T23:20:50.52Z"
+            }
+        }
+    },
     "SONIC_EVENTS_SWSS_PFC_STORM_WITH_INVALID_ADDITIONAL_INFO_1": {
         "sonic-events-swss:sonic-events-swss": {
             "sonic-events-swss:pfc-storm": {
diff --git a/src/sonic-yang-models/yang-models/sonic-events-swss.yang b/src/sonic-yang-models/yang-models/sonic-events-swss.yang
index 93c617776c..4092fe42d2 100644
--- a/src/sonic-yang-models/yang-models/sonic-events-swss.yang
+++ b/src/sonic-yang-models/yang-models/sonic-events-swss.yang
@@ -80,7 +80,7 @@ module sonic-events-swss {
 
             leaf additional_info {
                 type string {
-                    pattern '[-a-zA-Z0-9_]+:[-a-zA-Z0-9_]+(\|{1}[-a-zA-Z0-9_]+:[-a-zA-Z0-9_]+)*';
+                    pattern '[-a-zA-Z0-9_]+:[-a-zA-Z0-9_.]+(\|{1}[-a-zA-Z0-9_]+:[-a-zA-Z0-9_.]+)*';
                 }
                 description "Additional information to investigate PFC storm";
             }