diff --git a/src/aspire/abinitio/commonline_c2.py b/src/aspire/abinitio/commonline_c2.py
index 7e36cfe45e..6bf6cf99ed 100644
--- a/src/aspire/abinitio/commonline_c2.py
+++ b/src/aspire/abinitio/commonline_c2.py
@@ -35,7 +35,7 @@ def __init__(
         self,
         src,
         n_rad=None,
-        n_theta=None,
+        n_theta=360,
         max_shift=0.15,
         shift_step=1,
         epsilon=1e-3,
@@ -50,7 +50,7 @@ def __init__(
 
         :param src: The source object of 2D denoised or class-averaged images with metadata
         :param n_rad: The number of points in the radial direction
-        :param n_theta: The number of points in the theta direction
+        :param n_theta: The number of points in the theta direction. Default = 360.
         :param max_shift: Maximum range for shifts as a proportion of resolution. Default = 0.15.
         :param shift_step: Resolution of shift estimation in pixels. Default = 1 pixel.
         :param epsilon: Tolerance for the power method.
diff --git a/src/aspire/abinitio/commonline_c3_c4.py b/src/aspire/abinitio/commonline_c3_c4.py
index 242094b745..0170d8b88f 100644
--- a/src/aspire/abinitio/commonline_c3_c4.py
+++ b/src/aspire/abinitio/commonline_c3_c4.py
@@ -44,7 +44,7 @@ def __init__(
         src,
         symmetry=None,
         n_rad=None,
-        n_theta=None,
+        n_theta=360,
         max_shift=0.15,
         shift_step=1,
         epsilon=1e-2,
@@ -59,7 +59,7 @@ def __init__(
         :param src: The source object of 2D denoised or class-averaged images with metadata
         :param symmetry: A string, 'C3' or 'C4', indicating the symmetry type.
         :param n_rad: The number of points in the radial direction
-        :param n_theta: The number of points in the theta direction
+        :param n_theta: The number of points in the theta direction. Default = 360.
         :param max_shift: Maximum range for shifts as a proportion of resolution. Default = 0.15.
         :param shift_step: Resolution of shift estimation in pixels. Default = 1 pixel.
         :param epsilon: Tolerance for the power method.
diff --git a/src/aspire/abinitio/commonline_cn.py b/src/aspire/abinitio/commonline_cn.py
index 94c9fa3ca3..a1440cadc3 100644
--- a/src/aspire/abinitio/commonline_cn.py
+++ b/src/aspire/abinitio/commonline_cn.py
@@ -31,7 +31,7 @@ def __init__(
         src,
         symmetry=None,
         n_rad=None,
-        n_theta=None,
+        n_theta=360,
         max_shift=0.15,
         shift_step=1,
         epsilon=1e-3,
@@ -48,7 +48,7 @@ def __init__(
         :param src: The source object of 2D denoised or class-averaged images with metadata
         :param symmetry: A string, 'Cn', indicating the symmetry type.
         :param n_rad: The number of points in the radial direction.
-        :param n_theta: The number of points in the theta direction.
+        :param n_theta: The number of points in the theta direction. Default = 360.
         :param max_shift: Maximum range for shifts as a proportion of resolution. Default = 0.15.
         :param shift_step: Resolution of shift estimation in pixels. Default = 1 pixel.
         :param epsilon: Tolerance for the power method.
diff --git a/src/aspire/abinitio/commonline_d2.py b/src/aspire/abinitio/commonline_d2.py
index 6c930105c7..8acbade2ca 100644
--- a/src/aspire/abinitio/commonline_d2.py
+++ b/src/aspire/abinitio/commonline_d2.py
@@ -28,7 +28,7 @@ def __init__(
         self,
         src,
         n_rad=None,
-        n_theta=None,
+        n_theta=360,
         max_shift=0.15,
         shift_step=1,
         grid_res=1200,
@@ -43,7 +43,7 @@ def __init__(
 
         :param src: The source object of 2D denoised or class-averaged images with metadata
         :param n_rad: The number of points in the radial direction of Fourier image.
-        :param n_theta: The number of points in the theta direction of Fourier image.
+        :param n_theta: The number of points in the theta direction of Fourier image. Default = 360.
         :param max_shift: Maximum range for shifts as a proportion of resolution. Default = 0.15.
         :param shift_step: Resolution of shift estimation in pixels. Default = 1 pixel.
         :param grid_res: Number of sampling points on sphere for projetion directions.
diff --git a/tests/test_orient_symmetric.py b/tests/test_orient_symmetric.py
index 8fe5423785..9ab63459df 100644
--- a/tests/test_orient_symmetric.py
+++ b/tests/test_orient_symmetric.py
@@ -84,9 +84,9 @@ def source_orientation_objs(n_img, L, order, dtype):
         seed=seed,
     )
 
+    # Use default n_theta = 360.
     cl_kwargs = dict(
         src=src,
-        n_theta=360,
         max_shift=1 / L,
         seed=seed,
         mask=False,