diff --git a/redback/priors/csm_shock_breakout.prior b/redback/priors/csm_shock_breakout.prior
index a7508574..5da727bc 100644
--- a/redback/priors/csm_shock_breakout.prior
+++ b/redback/priors/csm_shock_breakout.prior
@@ -1,7 +1,7 @@
 redshift = Uniform(0.01, 1, 'redshift', latex_label=r'$z$')
-csm_mass = LogUniform(1e-3, 10, 'csm_mass', latex_label=r'$M_{\mathrm{CSM}}~(M_{\odot})$')
-v_min = LogUniform(1e3, 1e5, 'vej', latex_label = r'$v_{\mathrm{ej}}~(\mathrm{km}/\mathrm{s})$')
-beta = Uniform(0.1, 0.5, 'beta', latex_label=r'$\\beta$')
-kappa = Uniform(0.05, 2, 'kappa', latex_label = r'$\\kappa~(\mathrm{cm}^{2}/\mathrm{g})$')
-shell_radius = Uniform(1e-2, 1e2, 'shell_radius', latex_label=r'$R_{\mathrm{shell}}~(10^{14}~\mathrm{cm})$')
-shell_width_ratio = Uniform(0.1, 0.9, 'shell_width_ratio', latex_label=r'$\\Delta~R_{\mathrm{shell}}/R_{\mathrm{shell}}$')
\ No newline at end of file
+csm_mass = LogUniform(1e-3, 2, 'csm_mass', latex_label=r'$M_{\mathrm{CSM}}~(M_{\odot})$')
+v_min = LogUniform(1e3, 3e4, 'vej', latex_label = r'$v_{\mathrm{ej}}~(\mathrm{km}/\mathrm{s})$')
+beta = Uniform(0.4, 0.5, 'beta', latex_label=r'$\\beta$')
+kappa = Uniform(0.01, 1, 'kappa', latex_label = r'$\\kappa~(\mathrm{cm}^{2}/\mathrm{g})$')
+shell_radius = Uniform(1e-2, 10, 'shell_radius', latex_label=r'$R_{\mathrm{shell}}~(10^{14}~\mathrm{cm})$')
+shell_width_ratio = Uniform(0.1, 0.5, 'shell_width_ratio', latex_label=r'$\\Delta~R_{\mathrm{shell}}/R_{\mathrm{shell}}$')
\ No newline at end of file
diff --git a/redback/transient_models/shock_powered_models.py b/redback/transient_models/shock_powered_models.py
index 3bc10fb9..83f4702d 100644
--- a/redback/transient_models/shock_powered_models.py
+++ b/redback/transient_models/shock_powered_models.py
@@ -550,7 +550,7 @@ def _shocked_cocoon(time, mej, vej, eta, tshock, shocked_fraction, cos_theta_coc
     """
     :param time: source frame time in days
     :param mej: ejecta mass in solar masses
-    :param vej: ejecta mass in c
+    :param vej: ejecta velocity in c
     :param eta: slope for ejecta density profile
     :param tshock: shock time in seconds
     :param shocked_fraction: fraction of ejecta mass shocked
@@ -607,7 +607,7 @@ def shocked_cocoon(time, redshift, mej, vej, eta, tshock, shocked_fraction, cos_
     :param time: observer frame time in days
     :param redshift: redshift
     :param mej: ejecta mass in solar masses
-    :param vej: ejecta mass in km/s
+    :param vej: ejecta velocity in c
     :param eta: slope for ejecta density profile
     :param tshock: shock time in seconds
     :param shocked_fraction: fraction of ejecta mass shocked