diff --git a/Makefile b/Makefile
index bf722f0..93fa3b3 100644
--- a/Makefile
+++ b/Makefile
@@ -36,6 +36,7 @@ deps:
 	git clone --depth 1 https://github.com/antoinemadec/FixCursorHold.nvim deps/fixcursorhold
 	git clone --depth 1 https://github.com/mfussenegger/nvim-dap deps/nvimdap
 	git clone --depth 1 https://github.com/rcarriga/nvim-dap-ui deps/nvimdapui
+	git clone --depth 1 https://github.com/hedyhli/outline.nvim deps/outline
 
 test-ci: deps test
 
diff --git a/README.md b/README.md
index 9244637..53021f6 100644
--- a/README.md
+++ b/README.md
@@ -262,6 +262,7 @@ require("no-neck-pain").setup({
             -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
             reopen = true,
         },
+        -- @link https://github.com/rcarriga/nvim-dap-ui
         NvimDAPUI = {
             -- The position of the tree.
             --- @type "none"
@@ -269,6 +270,14 @@ require("no-neck-pain").setup({
             -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
             reopen = true,
         },
+        -- @link https://github.com/hedyhli/outline.nvim
+        outline = {
+            -- The position of the tree.
+            --- @type "left"|"right"
+            position = "right",
+            -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
+            reopen = true,
+        },
     },
 })
 
diff --git a/doc/no-neck-pain.txt b/doc/no-neck-pain.txt
index f5e8620..041296f 100644
--- a/doc/no-neck-pain.txt
+++ b/doc/no-neck-pain.txt
@@ -364,6 +364,14 @@ values:
               -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
               reopen = true,
           },
+          -- @link https://github.com/hedyhli/outline.nvim
+          outline = {
+              -- The position of the tree.
+              --- @type "left"|"right"
+              position = "right",
+              -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
+              reopen = true,
+          },
       },
   }
 
diff --git a/lua/no-neck-pain/config.lua b/lua/no-neck-pain/config.lua
index bdc526d..1d77211 100644
--- a/lua/no-neck-pain/config.lua
+++ b/lua/no-neck-pain/config.lua
@@ -300,6 +300,14 @@ NoNeckPain.options = {
             -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
             reopen = true,
         },
+        -- @link https://github.com/hedyhli/outline.nvim
+        outline = {
+            -- The position of the tree.
+            --- @type "left"|"right"
+            position = "right",
+            -- When `true`, if the tree was opened before enabling the plugin, we will reopen it.
+            reopen = true,
+        },
     },
 }
 
diff --git a/lua/no-neck-pain/util/constants.lua b/lua/no-neck-pain/util/constants.lua
index 78f8156..034b5c6 100644
--- a/lua/no-neck-pain/util/constants.lua
+++ b/lua/no-neck-pain/util/constants.lua
@@ -67,6 +67,11 @@ Co.INTEGRATIONS = {
         close = "lua require('dapui').close()",
         open = "lua require('dapui').open()",
     },
+    outline = {
+        fileTypePattern = "outline",
+        close = "Outline",
+        open = "Outline",
+    },
 }
 
 ---Dashboards filetypes that delays the plugin enable step until next buffer entered.
diff --git a/scripts/init_with_outline.lua b/scripts/init_with_outline.lua
new file mode 100644
index 0000000..4d74bd8
--- /dev/null
+++ b/scripts/init_with_outline.lua
@@ -0,0 +1,12 @@
+vim.cmd([[let &rtp.=','.getcwd()]])
+
+vim.cmd("set rtp+=deps/mini.nvim")
+vim.cmd("set rtp+=deps/outline")
+
+require("mini.test").setup()
+require("outline").setup()
+require("no-neck-pain").setup({
+    width = 1,
+    minSideBufferWidth = 0,
+    integrations = { outline = { reopen = true } },
+})
diff --git a/tests/test_API.lua b/tests/test_API.lua
index 8c5dac7..fbfbb69 100644
--- a/tests/test_API.lua
+++ b/tests/test_API.lua
@@ -146,6 +146,10 @@ T["setup"]["sets exposed methods and default options value"] = function()
         undotree = {
             position = "left",
         },
+        outline = {
+            position = "right",
+            reopen = true,
+        },
     })
 end
 
diff --git a/tests/test_integrations.lua b/tests/test_integrations.lua
index 4868c19..c019ad2 100644
--- a/tests/test_integrations.lua
+++ b/tests/test_integrations.lua
@@ -67,6 +67,10 @@ T["setup"]["overrides default values"] = function()
             position = "left",
             reopen = false,
         },
+        outline = {
+            position = "right",
+            reopen = true,
+        }
     })
 end
 
@@ -173,6 +177,35 @@ T["neotest"]["keeps sides open"] = function()
     })
 end
 
+T["outline"] = MiniTest.new_set()
+
+T["outline"]["keeps sides open"] = function()
+    child.restart({ "-u", "scripts/init_with_outline.lua", "lua/no-neck-pain/main.lua" })
+    child.set_size(20, 100)
+
+    Helpers.toggle(child)
+
+    Helpers.expect.equality(Helpers.winsInTab(child), { 1001, 1000, 1002 })
+    Helpers.expect.state(child, "tabs[1].wins.main", {
+        curr = 1000,
+        left = 1001,
+        right = 1002,
+    })
+
+    child.cmd("Outline")
+    vim.loop.sleep(50)
+
+    Helpers.expect.state(child, "tabs[1].wins.splits", vim.NIL)
+
+    Helpers.expect.state(child, "tabs[1].wins.integrations.outline", {
+        close = "Outline",
+        fileTypePattern = "outline",
+        id = 1004,
+        open = "Outline",
+        width = 40,
+    })
+end
+
 T["NvimTree"] = MiniTest.new_set()
 
 T["NvimTree"]["keeps sides open"] = function()
diff --git a/tests/test_tabs.lua b/tests/test_tabs.lua
index b7865b1..8c2e6cb 100644
--- a/tests/test_tabs.lua
+++ b/tests/test_tabs.lua
@@ -505,6 +505,11 @@ T["tabnew/tabclose"]["does not pick tab 1 for the first active tab"] = function(
                     fileTypePattern = "undotree",
                     open = "UndotreeToggle",
                 },
+                outline = {
+                    close = "Outline",
+                    fileTypePattern = "outline",
+                    open = "Outline",
+                },
             },
             main = {
                 curr = 1000,