diff --git a/src/lang/english.txt b/src/lang/english.txt
index 971eb8b557..66bfb9f4fc 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -2426,6 +2426,7 @@ STR_LINKGRAPH_LEGEND_CAPTION                                    :{BLACK}Cargo Fl
 STR_LINKGRAPH_LEGEND_ALL                                        :{BLACK}All
 STR_LINKGRAPH_LEGEND_NONE                                       :{BLACK}None
 STR_LINKGRAPH_LEGEND_SELECT_COMPANIES                           :{BLACK}Select companies to be displayed
+STR_LINKGRAPH_LEGEND_COMPANY_TOOLTIP                            :{BLACK}{STRING}{}{COMPANY}
 
 # Linkgraph legend window and linkgraph legend in smallmap
 STR_LINKGRAPH_LEGEND_UNUSED                                     :{TINY_FONT}{BLACK}unused
diff --git a/src/linkgraph/linkgraph_gui.cpp b/src/linkgraph/linkgraph_gui.cpp
index 1fe34fe79c..75c2ba66dc 100644
--- a/src/linkgraph/linkgraph_gui.cpp
+++ b/src/linkgraph/linkgraph_gui.cpp
@@ -319,7 +319,7 @@ void LinkGraphOverlay::SetCompanyMask(uint32 company_mask)
 /** Make a number of rows with buttons for each company for the linkgraph legend window. */
 NWidgetBase *MakeCompanyButtonRowsLinkGraphGUI(int *biggest_index)
 {
-	return MakeCompanyButtonRows(biggest_index, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST, 3, STR_LINKGRAPH_LEGEND_SELECT_COMPANIES);
+	return MakeCompanyButtonRows(biggest_index, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST, 3, 0);
 }
 
 NWidgetBase *MakeSaturationLegendLinkGraphGUI(int *biggest_index)
@@ -500,6 +500,28 @@ void LinkGraphLegendWindow::DrawWidget(const Rect &r, int widget) const
 	}
 }
 
+void LinkGraphLegendWindow::OnHover(Point pt, int widget)
+{
+	if (IsInsideMM(widget, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST + 1)) {
+		uint64 params[5];
+		if (this->IsWidgetDisabled(widget)) {
+			GuiShowTooltips(this, STR_LINKGRAPH_LEGEND_SELECT_COMPANIES, 0, params, TCC_HOVER);
+		} else {
+			CompanyID cid = (CompanyID)(widget - WID_LGL_COMPANY_FIRST);
+			params[0] = STR_LINKGRAPH_LEGEND_SELECT_COMPANIES;
+			params[1] = cid;
+			GuiShowTooltips(this, STR_LINKGRAPH_LEGEND_COMPANY_TOOLTIP, 2, params, TCC_HOVER);
+		}
+	}
+	if (IsInsideMM(widget, WID_LGL_CARGO_FIRST, WID_LGL_CARGO_LAST + 1)) {
+		if (this->IsWidgetDisabled(widget)) return;
+		CargoSpec *cargo = CargoSpec::Get(widget - WID_LGL_CARGO_FIRST);
+		uint64 params[5];
+		params[0] = cargo->name;
+		GuiShowTooltips(this, STR_BLACK_STRING, 1, params, TCC_HOVER);
+	}
+}
+
 /**
  * Update the overlay with the new company selection.
  */
diff --git a/src/linkgraph/linkgraph_gui.h b/src/linkgraph/linkgraph_gui.h
index 1e306a44d4..20094ae792 100644
--- a/src/linkgraph/linkgraph_gui.h
+++ b/src/linkgraph/linkgraph_gui.h
@@ -102,6 +102,7 @@ public:
 
 	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize);
 	virtual void DrawWidget(const Rect &r, int widget) const;
+	virtual void OnHover(Point pt, int widget) override;
 	virtual void OnClick(Point pt, int widget, int click_count);
 	virtual void OnInvalidateData(int data = 0, bool gui_scope = true);