diff --git a/src/idl/dustem_write_isrf_lv.pro b/src/idl/dustem_write_isrf_lv.pro
index 71239d4..903bb37 100755
--- a/src/idl/dustem_write_isrf_lv.pro
+++ b/src/idl/dustem_write_isrf_lv.pro
@@ -54,7 +54,7 @@ IF ctpop NE 0 or ctusrisrf NE 0 THEN BEGIN
     
     G0_mathis = 0. ;Just an initialization
     ;The initial test was going to be on ((*!dustem_params).g0) and ((*!dustem_params).gas.g0) but it isn't enough...
-    ;this is because the case where mathis ISRF is used with G0=1 oughtn't be forgotten and should be distinguished
+    ;this is because the case where mathis ISRF is used with G0=1 oughtn't be forgotten and should be distinguishable
     ;A solution is to instead test on the parameter vectors (fixed and thawed alike)
 
     ;Locating G0 in the free parameters vector
--
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