diff --git a/src/diagnostics.lua b/src/diagnostics.lua
index 17c98d6..bab15db 100644
--- a/src/diagnostics.lua
+++ b/src/diagnostics.lua
@@ -147,26 +147,28 @@ function M.validate_diagnostics(content, workspace_types, root_dir)
     end
 
     if not in_var_section then
-      local hash_vars = {}
-      for var in line:gmatch("#[%w_]+") do
-        local var_name = var:sub(2)
-        local match_start = line:find(var, 1, true)
-        if not is_iec_literal_at(line, match_start) and not is_number_literal_at(line, match_start) then
-          hash_vars[var_name] = true
+      if not (trimmed:match("^%s*//") or trimmed:match("^%s*%(%*")) then
+        local hash_vars = {}
+        for var in line:gmatch("#[%w_]+") do
+          local var_name = var:sub(2)
+          local match_start = line:find(var, 1, true)
+          if not is_iec_literal_at(line, match_start) and not is_number_literal_at(line, match_start) then
+            hash_vars[var_name] = true
+          end
         end
-      end
 
-      for var_name, _ in pairs(hash_vars) do
-        if not variables[var_name] and not all_types[var_name] then
-          local var_start = line:find("#" .. var_name, 1, true)
-          if var_start then
-            table.insert(diagnostics, {
-              range = range_to_lsp(line_num, var_start - 1, line_num, var_start + #var_name - 1),
-              severity = DiagnosticSeverity.Error,
-              message = string.format("Undefined variable: %s", var_name),
-              code = "SCL001",
-              source = "tia_lsp",
-            })
+        for var_name, _ in pairs(hash_vars) do
+          if not variables[var_name] and not all_types[var_name] then
+            local var_start = line:find("#" .. var_name, 1, true)
+            if var_start then
+              table.insert(diagnostics, {
+                range = range_to_lsp(line_num, var_start - 1, line_num, var_start + #var_name - 1),
+                severity = DiagnosticSeverity.Error,
+                message = string.format("Undefined variable: %s", var_name),
+                code = "SCL001",
+                source = "tia_lsp",
+              })
+            end
           end
         end
       end