diff --git a/lib/node_modules/@stdlib/random/iter/frechet/lib/main.js b/lib/node_modules/@stdlib/random/iter/frechet/lib/main.js
index b45e4867d26e..d7706a635185 100644
--- a/lib/node_modules/@stdlib/random/iter/frechet/lib/main.js
+++ b/lib/node_modules/@stdlib/random/iter/frechet/lib/main.js
@@ -87,7 +87,7 @@ function iterator( alpha, s, m, options ) {
 		throw new TypeError( format( 'invalid argument. Second argument must be a positive number. Value: `%s`.', s ) );
 	}
 	if ( !isNumber( m ) || isnan( m ) ) {
-		throw new TypeError( format( 'invalid argument. Third argument must be a number. Value: `%s`.', m ) );
+		throw new TypeError( format( 'invalid argument. Third argument must be a number and not NaN. Value: `%s`.', m ) );
 	}
 	if ( arguments.length > 3 ) {
 		if ( !isObject( options ) ) {
diff --git a/lib/node_modules/@stdlib/random/iter/negative-binomial/lib/main.js b/lib/node_modules/@stdlib/random/iter/negative-binomial/lib/main.js
index ecfed4ab921d..86e95fa05457 100644
--- a/lib/node_modules/@stdlib/random/iter/negative-binomial/lib/main.js
+++ b/lib/node_modules/@stdlib/random/iter/negative-binomial/lib/main.js
@@ -78,7 +78,7 @@ function iterator( r, p, options ) {
 	var FLG;
 	var i;
 	if ( !isPositiveNumber( r ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be a positive integer. Value: `%s`.', r ) );
+		throw new TypeError( format( 'invalid argument. First argument must be a positive number. Value: `%s`.', r ) );
 	}
 	if ( !isProbability( p ) ) {
 		throw new TypeError( format( 'invalid argument. Second argument must be a probability. Value: `%s`.', p ) );