diff --git a/src/main/resources/org/eolang/lints/comments/comment-not-capitalized.xsl b/src/main/resources/org/eolang/lints/comments/comment-not-capitalized.xsl
index 822b6afd1..7b218c496 100644
--- a/src/main/resources/org/eolang/lints/comments/comment-not-capitalized.xsl
+++ b/src/main/resources/org/eolang/lints/comments/comment-not-capitalized.xsl
@@ -10,7 +10,7 @@
   <xsl:template match="/">
     <xsl:variable name="min" select="32"/>
     <defects>
-      <xsl:for-each select="/object/comments/comment[not(matches(., '^[A-Z]'))]">
+      <xsl:for-each select="/object/comments/comment[not(matches(., '^[A-Z]')) and not(matches(., '^@(todo|fixme)([^A-Z]|$)', 'i'))]">
         <xsl:element name="defect">
           <xsl:variable name="line" select="eo:lineno(@line)"/>
           <xsl:attribute name="line">
diff --git a/src/main/resources/org/eolang/motives/comments/comment-not-capitalized.md b/src/main/resources/org/eolang/motives/comments/comment-not-capitalized.md
index 5c81d4c54..40a2ffab6 100644
--- a/src/main/resources/org/eolang/motives/comments/comment-not-capitalized.md
+++ b/src/main/resources/org/eolang/motives/comments/comment-not-capitalized.md
@@ -17,3 +17,12 @@ Correct:
 [] > foo
   42 > @
 ```
+
+Comments that begin with a tracker marker such as `@todo` or `@fixme`
+(case-insensitive) are exempt from this rule:
+
+```eo
+# @todo #123:30min Add validation for negative input.
+[] > foo
+  42 > @
+```
diff --git a/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-fixme-marker.yaml b/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-fixme-marker.yaml
new file mode 100644
index 000000000..aa3dd0fee
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-fixme-marker.yaml
@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2026 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/comments/comment-not-capitalized.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=0]
+input: |
+  # @fixme this needs revisiting once the parser supports X.
+  [] > foo
+    42 > @
diff --git a/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-todo-case-insensitive.yaml b/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-todo-case-insensitive.yaml
new file mode 100644
index 000000000..85af68476
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-todo-case-insensitive.yaml
@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2026 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/comments/comment-not-capitalized.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=0]
+input: |
+  # @TODO #999:30min uppercase marker is also accepted.
+  [] > foo
+    42 > @
diff --git a/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-todo-marker.yaml b/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-todo-marker.yaml
new file mode 100644
index 000000000..96508ec1a
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/comment-not-capitalized/allows-todo-marker.yaml
@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2026 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/comments/comment-not-capitalized.xsl
+asserts:
+  - /defects[count(defect[@severity='warning'])=0]
+input: |
+  # @todo #4475:35min Enable this feature after resize is implemented.
+  [] > foo
+    42 > @