diff --git a/skill/sdpm/builder/elements/shape.py b/skill/sdpm/builder/elements/shape.py
index 7386ab1e..6c9f9a32 100644
--- a/skill/sdpm/builder/elements/shape.py
+++ b/skill/sdpm/builder/elements/shape.py
@@ -87,6 +87,7 @@ def _add_shape(self, slide, elem):
             "right_bracket": MSO_SHAPE.RIGHT_BRACKET,
             "cylinder": MSO_SHAPE.CAN,
             "math_not_equal": MSO_SHAPE.MATH_NOT_EQUAL,
+            "folded_corner": MSO_SHAPE.FOLDED_CORNER,
         }
         
         mso_shape = shape_map.get(shape_type)
diff --git a/skill/sdpm/converter/elements.py b/skill/sdpm/converter/elements.py
index d432b79a..be811c6e 100644
--- a/skill/sdpm/converter/elements.py
+++ b/skill/sdpm/converter/elements.py
@@ -44,6 +44,7 @@
     'flowChartTerminator': 'flowchart_terminator',
     'leftBracket': 'left_bracket', 'rightBracket': 'right_bracket',
     'can': 'cylinder', 'mathNotEqual': 'math_not_equal',
+    'foldedCorner': 'folded_corner',
 }
 
 def _resolve_shape_name(shape):
diff --git a/skill/sdpm/schema/lint.py b/skill/sdpm/schema/lint.py
index 446d42af..c09668d6 100644
--- a/skill/sdpm/schema/lint.py
+++ b/skill/sdpm/schema/lint.py
@@ -204,6 +204,7 @@ def _lint_line(si: int, ei: int, elem: dict) -> list[dict]:
     "callout_rectangle", "callout_rounded_rectangle", "callout_oval",
     "flowchart_process", "flowchart_decision", "flowchart_terminator",
     "left_brace", "right_brace", "left_bracket", "right_bracket",
+    "folded_corner",
 }