Index: src/sas/sasgui/perspectives/corfunc/media/corfunc_help.rst
===================================================================
--- src/sas/sasgui/perspectives/corfunc/media/corfunc_help.rst	(revision 501712f1244207d4374798e9fc89547f1f6af96d)
+++ src/sas/sasgui/perspectives/corfunc/media/corfunc_help.rst	(revision 490f79075e15c069f2a131d3ccd6a1e510e7dcfe)
@@ -33,6 +33,6 @@
 Both analyses are performed in 3 stages:
 
-*  Extrapolation of the scattering curve to :math:`Q = 0` and toward 
-   :math:`Q = \infty`
+*  Extrapolation of the scattering curve to :math:`q = 0` and toward 
+   :math:`q = \infty`
 *  Smoothed merging of the two extrapolations into the original data
 *  Fourier / Hilbert Transform of the smoothed data to give the correlation
@@ -47,5 +47,5 @@
 -------------
 
-To :math:`Q = 0`
+To :math:`q = 0`
 ................
 
@@ -67,5 +67,5 @@
 the impact on any extrapolated parameters will be least significant.
 
-To :math:`Q = \infty`
+To :math:`q = \infty`
 .....................
 
@@ -145,7 +145,7 @@
 	- do they smoothly curve onto the ordinate at x = 0? (if not check the value 
 	  of :math:`\sigma` is sensible)
-	- are there ripples at x values corresponding to (2 :math:`pi` over) the two 
+	- are there ripples at x values corresponding to (2 :math:`\pi` over) the two 
 	  q values at which the extrapolated and experimental data are merged?
-	- are there any artefacts at x values corresponding to 2 :math:`pi` / q\ :sub:`max` in 
+	- are there any artefacts at x values corresponding to 2 :math:`\pi` / q\ :sub:`max` in 
 	  the experimental data? 
 	- and lastly, do the significant features/peaks in the correlation functions 
@@ -158,5 +158,6 @@
     -q^{4} I(q)
 
-The IDF is proportional to the second derivative of Î\ :sub:`1`\ (x).
+The IDF is proportional to the second derivative of Î\ :sub:`1`\ (x) and represents a 
+superposition of thickness distributions from all the contributing lamellae. 
 
 Hilbert
@@ -192,4 +193,8 @@
 *   Local Crystallinity :math:`= L_c/L_p`
 
+.. warning:: If the sample does not possess lamellar morphology then "Compute 
+    Parameters" will return garbage!
+	
+
 Volume Fraction Profile
 .......................
@@ -213,4 +218,5 @@
 
 The reader is directed to the references for information on these parameters.
+
 
 References
@@ -263,5 +269,8 @@
 Once the Q ranges have been set, click the "Calculate Bg" button to determine the 
 background level. Alternatively, enter your own value into the box. If the box turns 
-yellow this indicates that background subtraction has created some negative intensities.
+yellow this indicates that background subtraction has created some negative intensities. 
+This may still be fine provided the peak intensity is very much greater than the 
+background level. The important point is that the extrapolated dataset must approach 
+zero at high-q.
 
 Now click the "Extrapolate" button to extrapolate the data. The graph window will update 
@@ -296,3 +305,3 @@
 
 .. note::
-    This help document was last changed by Steve King, 26Sep2017
+    This help document was last changed by Steve King, 28Sep2017
Index: src/sas/sasgui/perspectives/invariant/invariant_state.py
===================================================================
--- src/sas/sasgui/perspectives/invariant/invariant_state.py	(revision fa412df39d3c5338c2c5f69fed935b428f385ebe)
+++ src/sas/sasgui/perspectives/invariant/invariant_state.py	(revision e9920cd1fef162ad399cc9f42a588bb14006c327)
@@ -130,8 +130,10 @@
         my_time, date = self.timestamp
         file_name = self.file
+        from sas.sasview.__init__ import __version__ as sasview_version
 
         state_num = int(self.saved_state['state_num'])
         state = "\n[Invariant computation for %s: " % file_name
-        state += "performed at %s on %s] \n" % (my_time, date)
+        state += "performed at %s on %s] " % (my_time, date)
+        state += "[SasView v%s]\n" % (sasview_version)
         state += "State No.: %d \n" % state_num
         state += "\n=== Inputs ===\n"
