diff --git a/DESCRIPTION b/DESCRIPTION
index c95ca26..5d19e86 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: MSstatsBioNet
 Type: Package
 Title: Network Analysis for MS-based Proteomics Experiments
-Version: 1.5.1
+Version: 1.5.2
 Authors@R: c(
     person("Anthony", "Wu", email = "wu.anthon@northeastern.edu", 
         role = c("aut", "cre"), comment = c(ORCID = "0009-0001-7391-9902")),
diff --git a/inst/htmlwidgets/cytoscapeNetwork.js b/inst/htmlwidgets/cytoscapeNetwork.js
index 50a4f36..7f04a5a 100644
--- a/inst/htmlwidgets/cytoscapeNetwork.js
+++ b/inst/htmlwidgets/cytoscapeNetwork.js
@@ -226,6 +226,8 @@ HTMLWidgets.widget({
         })
         .join("");
 
+      var hasPtm = cyInstance.nodes('[node_type = "ptm"]').length > 0;
+
       legendEl.innerHTML =
         '<div style="font-weight:bold;margin-bottom:8px;font-size:13px;">Node color (logFC)</div>' +
         '<div style="display:flex;align-items:flex-start;margin-bottom:12px;">' +
@@ -234,8 +236,10 @@ HTMLWidgets.widget({
         '    <span>Upregulated</span><span>Neutral</span><span>Downregulated</span>' +
         '  </div></div>' +
         (edgeItems ? '<div style="font-weight:bold;margin-bottom:6px;font-size:13px;">Edge types</div>' + edgeItems : '') +
-        '<div style="margin-top:12px;padding:7px;background:#e3f2fd;border-radius:4px;font-size:10px;line-height:1.4;">' +
-        '<strong>PTM info:</strong> Hover over edges to see overlapping PTM sites.</div>' +
+        (hasPtm
+          ? '<div style="margin-top:12px;padding:7px;background:#e3f2fd;border-radius:4px;font-size:10px;line-height:1.4;">' +
+            '<strong>PTM info:</strong> Hover over edges to see overlapping PTM sites.</div>'
+          : '') +
         '<div style="margin-top:8px;padding:7px;background:#fff3cd;border-radius:4px;font-size:10px;line-height:1.4;">' +
         '<strong>Delete edge:</strong> Right-click or Ctrl+Click an edge to remove it from the network.</div>';
     }