diff --git a/diff_diff/bacon.py b/diff_diff/bacon.py
index 1ef55b7d..90438a9f 100644
--- a/diff_diff/bacon.py
+++ b/diff_diff/bacon.py
@@ -402,6 +402,7 @@ def __init__(self, weights: str = "approximate"):
         ----------
         weights : str, default="approximate"
             Weight calculation method:
+
             - "approximate": Fast simplified formula (default)
             - "exact": Variance-based weights from Goodman-Bacon (2021)
         """
diff --git a/diff_diff/chaisemartin_dhaultfoeuille_results.py b/diff_diff/chaisemartin_dhaultfoeuille_results.py
index 8c6dd470..b19a3bfe 100644
--- a/diff_diff/chaisemartin_dhaultfoeuille_results.py
+++ b/diff_diff/chaisemartin_dhaultfoeuille_results.py
@@ -893,7 +893,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            cv_label = f"CV (SE/|{overall_row_label}|):"
+            cv_label = f"CV (SE/abs({overall_row_label})):"
             lines.append(f"{cv_label:<25} {cv:>10.4f}")
 
         lines.append("")
diff --git a/diff_diff/continuous_did_results.py b/diff_diff/continuous_did_results.py
index 623937b6..f60ea5ea 100644
--- a/diff_diff/continuous_did_results.py
+++ b/diff_diff/continuous_did_results.py
@@ -276,7 +276,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/efficient_did_results.py b/diff_diff/efficient_did_results.py
index 6a393e7f..6ca90c17 100644
--- a/diff_diff/efficient_did_results.py
+++ b/diff_diff/efficient_did_results.py
@@ -260,7 +260,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/imputation_results.py b/diff_diff/imputation_results.py
index 03689c1f..a9e8a0ca 100644
--- a/diff_diff/imputation_results.py
+++ b/diff_diff/imputation_results.py
@@ -255,7 +255,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/results.py b/diff_diff/results.py
index e2270184..d7f4a3d8 100644
--- a/diff_diff/results.py
+++ b/diff_diff/results.py
@@ -249,7 +249,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         # Add significance codes
         lines.extend(
@@ -656,7 +656,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         # Add significance codes
         lines.extend(
@@ -1052,7 +1052,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         # Show top unit weights
         if self.unit_weights:
diff --git a/diff_diff/stacked_did_results.py b/diff_diff/stacked_did_results.py
index 6f1a6f02..e6a38e6e 100644
--- a/diff_diff/stacked_did_results.py
+++ b/diff_diff/stacked_did_results.py
@@ -212,7 +212,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/staggered_results.py b/diff_diff/staggered_results.py
index d9d14250..02b2cabd 100644
--- a/diff_diff/staggered_results.py
+++ b/diff_diff/staggered_results.py
@@ -234,7 +234,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/staggered_triple_diff_results.py b/diff_diff/staggered_triple_diff_results.py
index 29859169..be653e8b 100644
--- a/diff_diff/staggered_triple_diff_results.py
+++ b/diff_diff/staggered_triple_diff_results.py
@@ -196,7 +196,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/sun_abraham.py b/diff_diff/sun_abraham.py
index 3b999957..c33569e6 100644
--- a/diff_diff/sun_abraham.py
+++ b/diff_diff/sun_abraham.py
@@ -190,7 +190,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/diff_diff/trop_results.py b/diff_diff/trop_results.py
index 2d3d8535..45e54bd1 100644
--- a/diff_diff/trop_results.py
+++ b/diff_diff/trop_results.py
@@ -236,7 +236,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         # Add significance codes
         lines.extend(
diff --git a/diff_diff/two_stage_results.py b/diff_diff/two_stage_results.py
index 4563907b..591f0cd1 100644
--- a/diff_diff/two_stage_results.py
+++ b/diff_diff/two_stage_results.py
@@ -253,7 +253,7 @@ def summary(self, alpha: Optional[float] = None) -> str:
 
         cv = self.coef_var
         if np.isfinite(cv):
-            lines.append(f"{'CV (SE/|ATT|):':<25} {cv:>10.4f}")
+            lines.append(f"{'CV (SE/abs(ATT)):':<25} {cv:>10.4f}")
 
         lines.append("")
 
diff --git a/docs/tutorials/18_geo_experiments.ipynb b/docs/tutorials/18_geo_experiments.ipynb
index d2ff8098..129b0a03 100644
--- a/docs/tutorials/18_geo_experiments.ipynb
+++ b/docs/tutorials/18_geo_experiments.ipynb
@@ -500,7 +500,7 @@
       "---------------------------------------------------------------------------\n",
       "\n",
       "95% Confidence Interval: [297.5213, 326.1858]\n",
-      "CV (SE/|ATT|):                0.0234\n",
+      "CV (SE/abs(ATT)):                0.0234\n",
       "\n",
       "---------------------------------------------------------------------------\n",
       "                    Top Unit Weights (Synthetic Control)                   \n",