diff --git a/contributors.md b/contributors.md
index 9fca415e19..28e8cd45d7 100644
--- a/contributors.md
+++ b/contributors.md
@@ -82,6 +82,7 @@ The following people are not part of the development team, but have been contrib
 * Kevin Strehl (bitman2049) - Tile inspector keybindings
 * Anton Scharnowski (scrapes) - Added Scenery Scatter Options Window.
 * Chad Ian Anderson (pizza2004) - Added New Game option, bug fixes, misc.
+* Peter Ryszkiewicz (pRizz) - Added horizontal grid lines to finance charts.
 
 ## Bug fixes
 * (halfbro)
diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index 63a068cb60..f14760acbe 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -31,6 +31,7 @@
 - Fix: [#10739] Mountain tool overlay for even-numbered selections.
 - Fix: [#10752] Mute button state not correctly set at startup.
 - Improved: [#682] The staff patrol area is now drawn on the water, instead of on the surface under water.
+- Improved: [#10858] Added horizontal grid lines to finance charts.
 - Removed: [#6898] LOADMM and LOADRCT1 title sequence commands (use LOADSC instead).
 
 0.2.4 (2019-10-28)
diff --git a/src/openrct2-ui/windows/Finances.cpp b/src/openrct2-ui/windows/Finances.cpp
index 0f30b1b5c7..ef03d07941 100644
--- a/src/openrct2-ui/windows/Finances.cpp
+++ b/src/openrct2-ui/windows/Finances.cpp
@@ -879,6 +879,7 @@ static void window_finances_financial_graph_paint(rct_window* w, rct_drawpixelin
     {
         money32 axisValue = axisBase << yAxisScale;
         gfx_draw_string_right(dpi, STR_FINANCES_FINANCIAL_GRAPH_CASH_VALUE, &axisValue, COLOUR_BLACK, x + 70, y);
+        gfx_fill_rect_inset(dpi, x + 70, y + 5, graphLeft + 482, y + 5, w->colours[2], INSET_RECT_FLAG_BORDER_INSET);
         y += 39;
     }
 
@@ -980,6 +981,7 @@ static void window_finances_park_value_graph_paint(rct_window* w, rct_drawpixeli
     {
         money32 axisValue = axisBase << yAxisScale;
         gfx_draw_string_right(dpi, STR_FINANCES_FINANCIAL_GRAPH_CASH_VALUE, &axisValue, COLOUR_BLACK, x + 70, y);
+        gfx_fill_rect_inset(dpi, x + 70, y + 5, graphLeft + 482, y + 5, w->colours[2], INSET_RECT_FLAG_BORDER_INSET);
         y += 39;
     }
 
@@ -1083,6 +1085,7 @@ static void window_finances_profit_graph_paint(rct_window* w, rct_drawpixelinfo*
     {
         money32 axisValue = axisBase << yAxisScale;
         gfx_draw_string_right(dpi, STR_FINANCES_FINANCIAL_GRAPH_CASH_VALUE, &axisValue, COLOUR_BLACK, x + 70, y);
+        gfx_fill_rect_inset(dpi, x + 70, y + 5, graphLeft + 482, y + 5, w->colours[2], INSET_RECT_FLAG_BORDER_INSET);
         y += 39;
     }