diff --git a/zUtil_Maths/gtConvEnergyToWavelength.m b/zUtil_Maths/gtConvEnergyToWavelength.m
index 020226edb14e7efb5fb13401432f6d07c4e4e0c5..77bca69fa30b93cc3b56c651c5eae01d87db0119 100644
--- a/zUtil_Maths/gtConvEnergyToWavelength.m
+++ b/zUtil_Maths/gtConvEnergyToWavelength.m
@@ -1,15 +1,16 @@
+function lambda = gtConvEnergyToWavelength(energy)
+% GTCONVENERGYTOWAVELENGTH Converts X-ray energy to wavelength.
 %
-% Converts beam energy to wavelength. 
-%
-% gtConvEnergyToWavelength(50)= 0.2479
+% wavelength = gtConvEnergyToWavelength(energy)
 %
-% INPUT:    energy in keV
+% -----------------------------------------
 % 
-% OUTPUT:   wavelength in angstroms
+% INPUT
+%   energy  - energy in keV
+%
+% OUTPUT
+%   lambda  - wavelength in angstroms
 %
-
-
-function lambda = gtConvEnergyToWavelength(energy)
 
 lambda = 12.3984428./energy ;
 
diff --git a/zUtil_Maths/gtConvWavelengthToEnergy.m b/zUtil_Maths/gtConvWavelengthToEnergy.m
index 8772db17a4f6f6b7669723462a47828692032d6f..ffc64ebf4a5626c68ff05697ce6b7141ccd34bbd 100644
--- a/zUtil_Maths/gtConvWavelengthToEnergy.m
+++ b/zUtil_Maths/gtConvWavelengthToEnergy.m
@@ -1,9 +1,16 @@
+function energy = gtConvWavelengthToEnergy(lambda)
+% GTCONVWAVELENGTHTOENERGY Converts X-ray wavelength to energy.
+%
+% energy = gtConvWavelengthToEnergy(lambda)
 %
-% OUTPUT:    energy in keV
+% -----------------------------------------
 % 
-% INPUT:   wavelength in angstroms
+% INPUT
+%   lambda  - wavelength in angstroms
+%
+% OUTPUT
+%   energy  - energy in keV
 %
-function energy = gtConvWavelengthToEnergy(lambda)
 
 energy = 12.3984428./lambda;