diff --git a/src/portal/lib/src/create-edit-rule/create-edit-rule.component.html b/src/portal/lib/src/create-edit-rule/create-edit-rule.component.html
index 0952b5e45..95a4b8774 100644
--- a/src/portal/lib/src/create-edit-rule/create-edit-rule.component.html
+++ b/src/portal/lib/src/create-edit-rule/create-edit-rule.component.html
@@ -56,7 +56,10 @@
           <div formArrayName="src_namespaces">
             <div class="width-315" *ngFor="let src_namespace of src_namespaces.controls; let i=index">
               <div class="select endpointSelect pull-left">
-                <input type="text" [formControlName]="i" pattern="^[a-z0-9]+(?:[._-][a-z0-9]+)*$" class="inputWidth" required maxlength="255">
+                <label aria-haspopup="true" role="tooltip" class="tooltip tooltip-validation tooltip-md tooltip-bottom-left" [class.invalid]='(src_namespace.touched && src_namespace.invalid)'>
+                  <input type="text"  [formControlName]="i" pattern="^[a-z0-9]+(?:[._-][a-z0-9]+)*$" class="inputWidth" required maxlength="255">
+                  <span class="tooltip-content">{{'REPLICATION.NAMESPACE_TOOLTIP' | translate}}</span>
+                </label>
               </div>
               <clr-icon shape="times-circle" class="is-solid" (click)="deleteNamespace(i)"></clr-icon>
             </div>
@@ -95,7 +98,6 @@
         </div>
         <!--destination registry-->
         <div *ngIf="isPushMode" class="form-group form-group-override">
-
           <label class="form-group-label-override  required">{{'REPLICATION.DEST_REGISTRY' | translate}}</label>
           <div class="form-select">
             <div class="select endpointSelect pull-left">
diff --git a/src/portal/src/i18n/lang/en-us-lang.json b/src/portal/src/i18n/lang/en-us-lang.json
index 26034e604..f00d5620f 100644
--- a/src/portal/src/i18n/lang/en-us-lang.json
+++ b/src/portal/src/i18n/lang/en-us-lang.json
@@ -452,7 +452,8 @@
         "SOURCE_REGISTRY":"Source registry",
         "SOURCE_NAMESPACES":"Source namespaces",
         "DEST_REGISTRY":"Destination registry",
-        "DEST_NAMESPACE":"Destination namespace"
+        "DEST_NAMESPACE":"Destination namespace",
+        "NAMESPACE_TOOLTIP": "Namespace name should be at least 2 characters long with lower case characters, numbers and ._- and must be start with characters or numbers."
     },
     "DESTINATION": {
         "NEW_ENDPOINT": "New Endpoint",
diff --git a/src/portal/src/i18n/lang/es-es-lang.json b/src/portal/src/i18n/lang/es-es-lang.json
index fd54e5290..74498528a 100644
--- a/src/portal/src/i18n/lang/es-es-lang.json
+++ b/src/portal/src/i18n/lang/es-es-lang.json
@@ -453,7 +453,8 @@
         "SOURCE_REGISTRY":"Source registry",
         "SOURCE_NAMESPACES":"Source namespaces",
         "DEST_REGISTRY":"Destination registry",
-        "DEST_NAMESPACE":"Destination namespace"
+        "DEST_NAMESPACE":"Destination namespace",
+        "NAMESPACE_TOOLTIP": "Namespace name should be at least 2 characters long with lower case characters, numbers and ._- and must be start with characters or numbers."
     },
     "DESTINATION": {
         "NEW_ENDPOINT": "Nuevo Endpoint",
diff --git a/src/portal/src/i18n/lang/fr-fr-lang.json b/src/portal/src/i18n/lang/fr-fr-lang.json
index a9083081a..232333a04 100644
--- a/src/portal/src/i18n/lang/fr-fr-lang.json
+++ b/src/portal/src/i18n/lang/fr-fr-lang.json
@@ -434,7 +434,8 @@
         "SOURCE_REGISTRY":"Source registry",
         "SOURCE_NAMESPACES":"Source namespaces",
         "DEST_REGISTRY":"Destination registry",
-        "DEST_NAMESPACE":"Destination namespace"
+        "DEST_NAMESPACE":"Destination namespace",
+        "NAMESPACE_TOOLTIP": "Namespace name should be at least 2 characters long with lower case characters, numbers and ._- and must be start with characters or numbers."
     },
     "DESTINATION": {
         "NEW_ENDPOINT": "Nouveau Point Final",
diff --git a/src/portal/src/i18n/lang/pt-br-lang.json b/src/portal/src/i18n/lang/pt-br-lang.json
index 68dc95f97..0ce1d5404 100644
--- a/src/portal/src/i18n/lang/pt-br-lang.json
+++ b/src/portal/src/i18n/lang/pt-br-lang.json
@@ -452,7 +452,8 @@
         "SOURCE_REGISTRY":"Source registry",
         "SOURCE_NAMESPACES":"Source namespaces",
         "DEST_REGISTRY":"Destination registry",
-        "DEST_NAMESPACE":"Destination namespace"
+        "DEST_NAMESPACE":"Destination namespace",
+        "NAMESPACE_TOOLTIP": "Namespace name should be at least 2 characters long with lower case characters, numbers and ._- and must be start with characters or numbers."
     },
     "DESTINATION": {
         "NEW_ENDPOINT": "Novo Endpoint",
diff --git a/src/portal/src/i18n/lang/zh-cn-lang.json b/src/portal/src/i18n/lang/zh-cn-lang.json
index 01020ead3..b05b87147 100644
--- a/src/portal/src/i18n/lang/zh-cn-lang.json
+++ b/src/portal/src/i18n/lang/zh-cn-lang.json
@@ -453,7 +453,8 @@
         "SOURCE_REGISTRY":"源Registry",
         "SOURCE_NAMESPACES":"源Namespace",
         "DEST_REGISTRY":"目的Registry",
-        "DEST_NAMESPACE":"目的Namespace"
+        "DEST_NAMESPACE":"目的Namespace",
+        "NAMESPACE_TOOLTIP": "Namespace名称由小写字符、数字和._-组成且至少2个字符并以字符或者数字开头。"
     },
     "DESTINATION": {
         "NEW_ENDPOINT": "新建目标",