diff --git a/doc/changes/dev/14134.other.rst b/doc/changes/dev/14134.other.rst
new file mode 100644
index 00000000000..af84737c3f3
--- /dev/null
+++ b/doc/changes/dev/14134.other.rst
@@ -0,0 +1 @@
+Fix ten docstrings in private helpers that named a parameter the function does not take, and one that documented ``max_iter=1000`` for :func:`mne.decoding.csp._ajd_pham` while the signature has ``15``, by `Anton Karpov`_.
diff --git a/mne/_fiff/matrix.py b/mne/_fiff/matrix.py
index f27d86808f6..098986e9b37 100644
--- a/mne/_fiff/matrix.py
+++ b/mne/_fiff/matrix.py
@@ -103,7 +103,7 @@ def write_named_matrix(fid, kind, mat):
         The opened file descriptor.
     kind : int
         The kind of the matrix.
-    matkind : int
+    mat : int
         The type of matrix.
     """
     # let's save ourselves from disaster
diff --git a/mne/decoding/csp.py b/mne/decoding/csp.py
index 18d8d5e0246..c44833cbcc8 100644
--- a/mne/decoding/csp.py
+++ b/mne/decoding/csp.py
@@ -613,7 +613,7 @@ def _ajd_pham(X, eps=1e-6, max_iter=15):
         A set of covariance matrices to diagonalize.
     eps : float, default 1e-6
         The tolerance for stopping criterion.
-    max_iter : int, default 1000
+    max_iter : int, default 15
         The maximum number of iteration to reach convergence.
 
     Returns
diff --git a/mne/forward/_compute_forward.py b/mne/forward/_compute_forward.py
index dfd93e46a61..aa51beeb82e 100644
--- a/mne/forward/_compute_forward.py
+++ b/mne/forward/_compute_forward.py
@@ -68,9 +68,9 @@ def _lin_field_coeff(surf, mult, rmags, cosmags, ws, bins, n_jobs):
     mult : float
         Multiplier for particular BEM surface (Iso Skull Approach discussed in
         Mosher et al., 1999 and Hämäläinen and Sarvas, 1989 Section III?)
-    rmag : ndarray, shape (n_integration_pts, 3)
+    rmags : ndarray, shape (n_integration_pts, 3)
         3D positions of MEG coil integration points (from coil['rmag'])
-    cosmag : ndarray, shape (n_integration_pts, 3)
+    cosmags : ndarray, shape (n_integration_pts, 3)
         Direction of the MEG coil integration points (from coil['cosmag'])
     ws : ndarray, shape (n_integration_pts,)
         Weights for MEG coil integration points
@@ -116,9 +116,9 @@ def _do_lin_field_coeff(bem_rr, tris, tn, ta, rmags, cosmags, ws, bins):
         Triangle unit normal vectors
     ta : ndarray, shape (n_BEM_vertices,)
         Triangle areas
-    rmag : ndarray, shape (n_sensor_pts, 3)
+    rmags : ndarray, shape (n_sensor_pts, 3)
         3D positions of MEG coil integration points (from coil['rmag'])
-    cosmag : ndarray, shape (n_sensor_pts, 3)
+    cosmags : ndarray, shape (n_sensor_pts, 3)
         Direction of the MEG coil integration points (from coil['cosmag'])
     ws : ndarray, shape (n_sensor_pts,)
         Weights for MEG coil integration points
diff --git a/mne/preprocessing/maxwell.py b/mne/preprocessing/maxwell.py
index 2f013961293..809b7e648fe 100644
--- a/mne/preprocessing/maxwell.py
+++ b/mne/preprocessing/maxwell.py
@@ -1702,7 +1702,7 @@ def _sss_basis(exp, all_coils):
             ext_order : int
                 Order of the external multipolar moment space
 
-    coils : list
+    all_coils : list
         List of MEG coils. Each should contain coil information dict specifying
         position, normals, weights, number of integration points and channel
         type. All coil geometry must be in the same coordinate frame
diff --git a/mne/transforms.py b/mne/transforms.py
index 884e118c97d..94d8f10c30a 100644
--- a/mne/transforms.py
+++ b/mne/transforms.py
@@ -773,7 +773,7 @@ def _cart_to_sph(cart):
 
     Parameters
     ----------
-    cart_pts : ndarray, shape (n_points, 3)
+    cart : ndarray, shape (n_points, 3)
         Array containing points in Cartesian coordinates (x, y, z)
 
     Returns
diff --git a/mne/viz/backends/_abstract.py b/mne/viz/backends/_abstract.py
index 5634cd126e4..bd80f1dbc71 100644
--- a/mne/viz/backends/_abstract.py
+++ b/mne/viz/backends/_abstract.py
@@ -555,10 +555,10 @@ def text2d(
 
         Parameters
         ----------
-        x : float
+        x_window : float
             The X component to use as position of the text in the
             window coordinates system (window_width, window_height).
-        y : float
+        y_window : float
             The Y component to use as position of the text in the
             window coordinates system (window_width, window_height).
         text : str