diff --git a/lua/cp/runner/run.lua b/lua/cp/runner/run.lua
index 9480ca3..4588257 100644
--- a/lua/cp/runner/run.lua
+++ b/lua/cp/runner/run.lua
@@ -4,7 +4,7 @@
 ---@field expected string
 ---@field status "pending"|"pass"|"fail"|"running"|"timeout"
 ---@field actual string?
----@field actual_highlights? any[]
+---@field actual_highlights? Highlight[]
 ---@field time_ms number?
 ---@field error string?
 ---@field stderr string?
diff --git a/lua/cp/runner/run_render.lua b/lua/cp/runner/run_render.lua
index 33eb3f6..99fbcbe 100644
--- a/lua/cp/runner/run_render.lua
+++ b/lua/cp/runner/run_render.lua
@@ -278,7 +278,7 @@ local function data_row(c, idx, tc, is_current, test_state)
 end
 
 ---@param test_state RunPanelState
----@return string[], any[] lines and highlight positions
+---@return string[], Highlight[] lines and highlight positions
 function M.render_test_list(test_state)
   local lines, highlights = {}, {}
   local c = compute_cols(test_state)
diff --git a/lua/cp/ui/ansi.lua b/lua/cp/ui/ansi.lua
index 893b0db..0d31bdd 100644
--- a/lua/cp/ui/ansi.lua
+++ b/lua/cp/ui/ansi.lua
@@ -1,6 +1,12 @@
 ---@class AnsiParseResult
 ---@field lines string[]
----@field highlights any[]
+---@field highlights Highlight[]
+
+---@class Highlight
+---@field line number
+---@field col_start number
+---@field col_end number
+---@field highlight_group string
 
 local M = {}
 
diff --git a/lua/cp/ui/diff.lua b/lua/cp/ui/diff.lua
index 819fa3f..c3fe7cd 100644
--- a/lua/cp/ui/diff.lua
+++ b/lua/cp/ui/diff.lua
@@ -1,6 +1,6 @@
 ---@class DiffResult
 ---@field content string[]
----@field highlights any[]?
+---@field highlights Highlight[]?
 ---@field raw_diff string?
 
 ---@class DiffBackend