diff --git a/orgSeries-admin.css b/orgSeries-admin.css
index 21449ad1..4a833355 100644
--- a/orgSeries-admin.css
+++ b/orgSeries-admin.css
@@ -1,3 +1,13 @@
+.publishpress-series-permalink-error {
+    background: #fff;
+    border: 1px solid #c3c4c7;
+    border-left-width: 4px;
+    box-shadow: 0 1px 1px rgb(0 0 0 / 4%);
+    border-left-color: #d63638;
+    margin: 5px 0 15px;
+    padding: 5px 5px;
+}
+
 .ppseries-settings-tab-content .description {
     font-weight: initial;
 }
diff --git a/orgSeries-options.php b/orgSeries-options.php
index a106e9b5..89661163 100644
--- a/orgSeries-options.php
+++ b/orgSeries-options.php
@@ -536,6 +536,26 @@ function series_automation_core_fieldset() {
 									<td>
                                         <span id="toc-home-url"><?php bloginfo('url') ?>/</span><input type="text" name="<?php echo esc_attr($org_name); ?>[series_toc_url]" id="series_toc_url" value="<?php echo isset($org_opt['series_toc_url']) ? esc_attr(htmlspecialchars($org_opt['series_toc_url'])) : ''; ?>" />
                                         <button onclick="gotoTOCUrl(event)" class="button">view page</button>
+
+                                        <?php 
+                                        global $wp_rewrite;
+                                        if ( empty( $wp_rewrite->permalink_structure ) ) {
+                                            ?>
+                                            <div class="publishpress-series-permalink-error">
+                                                <p>
+                                                    <?php 
+                                                    printf(
+                                                        esc_html__( 'You must %1s update your permalink structure %2s to something other than the default for Series Table of Contents url to work.', 'organize-series' ),
+                                                        '<a href="' . admin_url('options-permalink.php') . '">',
+                                                        '</a>'
+                                                    ); 
+                                                    ?>
+                                                </p>
+                                            </div>
+                                            <?php
+                                        }
+                                        ?>
+
                                     </td>
 								</tr>
                                 <script>