Index: /issm/trunk/src/m/coordsystems/gmtmask.m
===================================================================
--- /issm/trunk/src/m/coordsystems/gmtmask.m	(revision 22791)
+++ /issm/trunk/src/m/coordsystems/gmtmask.m	(revision 22792)
@@ -41,5 +41,5 @@
 	end
 
-   %Find path to gmt
+	%Find path to gmt, list all possible known paths to gmt (you may need to add yours to the list)
    paths = {[issmdir() '/bin/gmt'],[issmdir() '/externalpackages/gmt/install/bin/gmt'],'/Applications/GMT-5.4.3.app/Contents/Resources/bin/gmt'};
    gmtpath = '';
@@ -51,5 +51,5 @@
    end
    if isempty(gmtpath),
-      error('gmt not found, make sure it is properly installed');
+      error('gmt not found, make sure it is properly installed, or add its path to this file (line 44)');
    end
    
Index: /issm/trunk/src/m/coordsystems/gmtmaskparallel.m
===================================================================
--- /issm/trunk/src/m/coordsystems/gmtmaskparallel.m	(revision 22791)
+++ /issm/trunk/src/m/coordsystems/gmtmaskparallel.m	(revision 22792)
@@ -23,5 +23,5 @@
 	end
 
-   %Find path to gmt
+	%Find path to gmt, list all possible known paths to gmt (you may need to add yours to the list)
    paths = {[issmdir() '/bin/gmt'],[issmdir() '/externalpackages/gmt/install/bin/gmt'],'/Applications/GMT-5.4.3.app/Contents/Resources/bin/gmt'};
    gmtpath = '';
@@ -33,5 +33,5 @@
    end
    if isempty(gmtpath),
-      error('gmt not found, make sure it is properly installed');
+		error('gmt not found, make sure it is properly installed, or add its path to this file (line 26)');
    end