diff --git a/d3graph/d3graph.py b/d3graph/d3graph.py
index f01e810..61453af 100644
--- a/d3graph/d3graph.py
+++ b/d3graph/d3graph.py
@@ -823,10 +823,10 @@ def set_path(self, filepath=None) -> str:
             dirname = os.path.join(gettempdir(), 'd3graph')
         else:
             dirname, filename = os.path.split(filepath)
-    
+
             if filename in (None, ''):
                 filename = 'd3graph.html'
-    
+
             if dirname in (None, ''):
                 dirname = os.path.join(gettempdir(), 'd3graph')
 
@@ -1009,6 +1009,7 @@ def json_create(G: nx.Graph) -> str:
         links[i]['label'] = links[i]['label']
         links[i]['label_color'] = links[i]['label_color']
         links[i]['label_fontsize'] = links[i]['label_fontsize']
+        links[i]['tooltip'] = links[i]['tooltip']
         links_new.append(links[i])
 
     # Set node properties
@@ -1125,6 +1126,7 @@ def adjmat2dict(adjmat: pd.DataFrame,
             'label': Text label for the edge.
             'label_color': color of the label.
             'label_fontsize': fontsize of the label.
+            'tooltip': Text that is shown when hovering over the edge.
 
     """
     # Convert adjacency matrix into vector
@@ -1192,15 +1194,8 @@ def adjmat2dict(adjmat: pd.DataFrame,
     df['label_fontsize']=label_fontsize
     df['edge_style']=edge_style
     df['edge_opacity'] = edge_opacity
+    df['tooltip'] = df['weight'].astype(str)
 
-    # Handle node_source edge color
-    if edge_color == 'node_source' and node_color_map is not None:
-        df['edge_color'] = df['source'].map(node_color_map)
-    elif edge_color == 'node_target' and node_color_map is not None:
-        df['edge_color'] = df['target'].map(node_color_map)
-    else:
-        df['edge_color'] = edge_color
-        
     # Creation dictionary
     source_target = list(zip(df['source'], df['target']))
     if len(source_target)==0:
@@ -1218,6 +1213,7 @@ def adjmat2dict(adjmat: pd.DataFrame,
                    'label': df['label'].iloc[i],
                    'label_color': df['label_color'].iloc[i],
                    'label_fontsize': df['label_fontsize'].iloc[i],
+                   'tooltip': df['tooltip'].iloc[i]
                    } for
             i, edge in enumerate(source_target)}
 
@@ -1294,6 +1290,7 @@ def edges2G(edge_properties: dict, G: nx.Graph = None) -> nx.Graph:
                    label=edge_properties[edge]['label'],
                    label_color=edge_properties[edge]['label_color'],
                    label_fontsize=edge_properties[edge]['label_fontsize'],
+                   tooltip=edge_properties[edge]['tooltip']
                    )
     return G
 
diff --git a/d3graph/d3js/d3graphscript.js b/d3graph/d3js/d3graphscript.js
index 3cfdbaa..d118039 100644
--- a/d3graph/d3js/d3graphscript.js
+++ b/d3graph/d3js/d3graphscript.js
@@ -82,6 +82,8 @@ function d3graphscript(config = {
 //  .style("stroke-width", 1); // WIDTH OF THE LINKS
   ;
 
+  link.append("title").text(function(d) { return d.tooltip; });
+
   // ADD TEXT ON THE EDGES (PART 1/2)
    var linkText = svg.selectAll(".link-text")
      .data(graph.links)