diff --git a/hapi/hapi.py b/hapi/hapi.py
index 3b8be0b..659f03d 100644
--- a/hapi/hapi.py
+++ b/hapi/hapi.py
@@ -4117,7 +4117,7 @@ def print_data_tutorial():
 HITRAN molecule-isotopologue notation, T - definition of temperature
 range.
 
-Usecase 1: temperatuer is defined by a list:
+Usecase 1: temperature is defined by a list:
 >>> Q = partitionSum(1,1,[70,80,90])
 
 Usecase 2: temperature is defined by bounds and the step:
@@ -4171,6 +4171,9 @@ def print_data_tutorial():
 # get data on CO2 main isotopologue in the range 2000-2100 cm-1
 >>> fetch('CO2',2,1,2000,2100)
 
+Note that CO2 was selected as molecule number 2, isotopologue 1.  The table
+name 'CO2' is arbitrary and does not select a specific molecule.
+
 OK, now we're ready to run a fast example of how to calculate an
 absorption coefficient cross section:
 
@@ -4279,7 +4282,7 @@ def print_data_tutorial():
 
   This is the name of broadening parameter to consider a "Lorentzian"
   part in the Voigt profile. In the current 160-char format there is 
-  a choise between "gamma_air" and "gamma_self".
+  a choice between "gamma_air" and "gamma_self".
   NOTE: If the table has custom columns with a broadening coefficients,
         the user can specify the name of this column in GammaL. This
         would let the function calculate an absorption with custom
@@ -4288,7 +4291,7 @@ def print_data_tutorial():
 HITRAN_units:    (optional parameter)
 
   Logical flag for units, in which the absorption coefficient shoould be 
-  calculated. Currently, the choises are: cm^2/molec (if True) and
+  calculated. Currently, the choices are: cm^2/molec (if True) and
   cm-1 (if False).
   NOTE: to calculate other spectral functions like transmitance,
   radiance and absorption spectra, user should set HITRAN_units to False.
@@ -4350,7 +4353,7 @@ def print_data_tutorial():
   This parameter is a bit specific for each of functions:
   For absorptionSpectrum() and transmittanceSpectrum() the default
   value is as follows: Environment={'l': 100.0}
-  For transmittanceSpectrum() the default value, besides path length,
+  For radianceSpectrum() the default value, besides path length,
   contains a temperature: Environment={'T': 296.0, 'l': 100.0}
   NOTE: temperature must be equal to that which was used in 
   absorptionCoefficient_ routine!
@@ -4436,7 +4439,7 @@ def print_data_tutorial():
 1) Quality of a convolution depends on many things: quality of calculated 
 spectra, width of AF_wing and WavenumberRange, Resolution, WavenumberStep etc ...
 Most of these factors are taken from previus stages of spectral calculation.
-Right choise of all these factors is crucial for the correct computation.
+Right choice of all these factors is crucial for the correct computation.
 2) Dispersion, Diffraction and Michelson AF's don't work well in narrow 
 wavenumber range because of their broad wings.
 3) Generally one must consider WavenumberRange and AF_wing as wide as possible.
@@ -35356,7 +35359,7 @@ def getDefaultValuesForXsect(Components,SourceTables,Environment,OmegaRange,
         Calculate absorption coefficient using {profile}.
         Absorption coefficient is calculated at arbitrary temperature and pressure.
         User can vary a wide range of parameters to control a process of calculation.
-        The choise of these parameters depends on properties of a particular linelist.
+        The choice of these parameters depends on properties of a particular linelist.
         Default values are a sort of guess which gives a decent precision (on average) 
         for a reasonable amount of cpu time. To increase calculation accuracy,
         user should use a trial and error method.