--- a/Matrix3_3.st	Wed Aug 21 23:06:15 2019 +0200
+++ b/Matrix3_3.st	Wed Aug 21 23:06:23 2019 +0200
@@ -42,7 +42,7 @@
     "this is a synthetic selector, generated by the compiler,
      if a construct of the form expr[idx...] is parsed.
      I.e. 
-        foo[n,m]
+        foo[n][m]
      generates
         foo _at:n at:m
     "
@@ -59,7 +59,7 @@
     "this is a synthetic selector, generated by the compiler,
      if a construct of the form expr[idx...] := val is parsed.
      I.e. 
-        foo[n,m] := val
+        foo[n][m] := val
      generates
         foo _at:n at:m put:val
     "