--- a/scripts/polynomial/mkpp.m
+++ b/scripts/polynomial/mkpp.m
@@ -21,7 +21,7 @@
 ## @deftypefnx {Function File} {@var{pp} =} mkpp (@var{x}, @var{p}, @var{d})
 ## 
 ## Construct a piece-wise polynomial structure from sample points
-## @var{x} and coefficients @var{p}.  The ith row of @var{p},
+## @var{x} and coefficients @var{p}.  The i-th row of @var{p},
 ## @code{@var{p} (@var{i},:)}, contains the coefficients for the polynomial
 ## over the @var{i}-th interval, ordered from highest to 
 ## lowest. There must be one row for each interval in @var{x}, so