diff --git a/SimPEG/EM/FDEM/SrcFDEM.py b/SimPEG/EM/FDEM/SrcFDEM.py
index ba57d39b..1213cef3 100644
--- a/SimPEG/EM/FDEM/SrcFDEM.py
+++ b/SimPEG/EM/FDEM/SrcFDEM.py
@@ -233,13 +233,13 @@ class MagDipole(BaseSrc):
 
     .. math:: 
         \mathbf{e^P} =  0 \\\\
-            {\mathbf{C}^T \mathbf{M_{\mu^{-1}}^f^P} \mathbf{b^P} = \mathbf{s_e^P}}
+            {\mathbf{C}^T \mathbf{{M_{\mu^{-1}}^f}^P} \mathbf{b^P} = \mathbf{s_e^P}}
 
     Our secondary problem is then 
 
     .. math::
         \mathbf{C} \mathbf{e^S} + i \omega \mathbf{b^S} = - i \omega \mathbf{b^P} \\\\
-            {\mathbf{C}^T \mathbf{M_{\mu^{-1}}^f} \mathbf{b^S} - \mathbf{M_{\sigma}^e} \mathbf{e^S} = -\mathbf{C}^T \mathbf{M_{\mu^{-1}^S}^f} \mathbf{b^P}}
+            {\mathbf{C}^T \mathbf{M_{\mu^{-1}}^f} \mathbf{b^S} - \mathbf{M_{\sigma}^e} \mathbf{e^S} = -\mathbf{C}^T \mathbf{{M_{\mu^{-1}}^f}^S} \mathbf{b^P}}
 
     :param list rxList: receiver list
     :param float freq: frequency
diff --git a/SimPEG/EM/FDEM/SurveyFDEM.py b/SimPEG/EM/FDEM/SurveyFDEM.py
index dd49b3ed..444df88d 100644
--- a/SimPEG/EM/FDEM/SurveyFDEM.py
+++ b/SimPEG/EM/FDEM/SurveyFDEM.py
@@ -166,7 +166,7 @@ class Survey(SimPEG.Survey.BaseSurvey):
         Returns the sources associated with a specific frequency.
         :param float freq: frequency for which we look up sources
         :rtype: dictionary
-        :returns: sources at the sepcified frequency 
+        :return: sources at the sepcified frequency 
         """
         assert freq in self._freqDict, "The requested frequency is not in this survey."
         return self._freqDict[freq]
@@ -176,7 +176,7 @@ class Survey(SimPEG.Survey.BaseSurvey):
         Project fields to receiver locations
         :param Fields u: fields object
         :rtype: numpy.ndarray
-        :returns: data
+        :return: data
         """
         data = SimPEG.Survey.Data(self)
         for src in self.srcList: