diff --git a/lib/matrix.js b/lib/matrix.js
index 4664820..3af9100 100644
--- a/lib/matrix.js
+++ b/lib/matrix.js
@@ -7,7 +7,7 @@
 * @param {Matrix} out - output matrix
 * @param {Matrix} mat - input matrix
 * @param {Boolean} [bias=false] - boolean indicating whether to calculate a biased or unbiased estimate of the variance
-* @param {Number} [dim=2] - matrix dimension along which to compute the maximum. If `dim=1`, compute along matrix rows. If `dim=2`, compute along matrix columns.
+* @param {Number} [dim=2] - matrix dimension along which to compute the variance. If `dim=1`, compute along matrix rows. If `dim=2`, compute along matrix columns.
 * @returns {Matrix|Null} variance or null
 */
 function variance( out, mat, bias, dim ) {
diff --git a/lib/validate.js b/lib/validate.js
index 08586e2..6e8b888 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -48,7 +48,7 @@ function validate( opts, options ) {
 	if ( options.hasOwnProperty( 'bias' ) ) {
 		opts.bias = options.bias;
 		if ( !isBoolean( opts.bias ) ) {
-			return new TypeError( 'variance()::invalid option. Bias option must be a boolean primitive. Option: `' + opts.dim + '`.' );
+			return new TypeError( 'variance()::invalid option. Bias option must be a boolean primitive. Option: `' + opts.bias + '`.' );
 		}
 	}
 	return null;