diff --git a/src/idl/dustem_compute_ext.pro b/src/idl/dustem_compute_ext.pro
index ba37ac7..b402950 100755
--- a/src/idl/dustem_compute_ext.pro
+++ b/src/idl/dustem_compute_ext.pro
@@ -1,33 +1,49 @@
 FUNCTION dustem_compute_ext,p_dim,$
-							st=st,$
-							EXT_spec=EXT_spec,$
-							help=help
+                            st=st,$
+                            EXT_spec=EXT_spec,$
+                            help=help
 
 ;+
 ; NAME:
 ;    dustem_compute_ext
+;  
 ; PURPOSE:
 ;    Computes Extinction in units of optical depth for a given Dustem spectrum
+;
 ; CATEGORY:
-;    Dustem
+;    DustEMWrap, Mid-level, Distributed
+;
 ; CALLING SEQUENCE:
 ;    ext=dustem_compute_ext(p_dim[,st=][,ext_spec=][,/help])
+;
 ; INPUTS:
 ;    p_dim      = parameter values
+;
 ; OPTIONAL INPUT PARAMETERS:
 ;    st        = Dustem output structure
+;
 ; OUTPUTS:
-;    ext       = computed EXT for spectrum points in !dustem_data 
+;    ext_spec  = computed EXT for spectrum points in !dustem_data 
+;
 ; OPTIONAL OUTPUT PARAMETERS:
-;    st        = Dustem output structure
+  ;    st        = Dustem output structure
+;
 ; ACCEPTED KEY-WORDS:
 ;    help      = If set, print this help
+;
 ; COMMON BLOCKS:
 ;    None
+;
 ; SIDE EFFECTS:
 ;    None
+;
 ; RESTRICTIONS:
-;    The dustem idl wrapper must be installed
+;    The DustEMWrap IDL code must be installed
+;  
+; MODIFICATION HISTORY:
+;    Written ?
+;    Evolution details on the DustEMWrap gitlab
+;    See http://dustemwrap.irap.omp.eu/ for FAQ and help.
 ;-
 
 IF keyword_set(help) THEN BEGIN
--
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