diff --git a/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/docs/types/index.d.ts b/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/docs/types/index.d.ts
index fb42d418ff60..926ccd83271e 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/docs/types/index.d.ts
@@ -61,6 +61,11 @@ interface CDF {
 	* @example
 	* var y = cdf( NaN, 0.0, 1.0 );
 	* // returns NaN
+	*
+	* @example
+	* // Negative scale parameter:
+	* var y = cdf( 2.0, 0.0, -1.0 );
+	* // returns NaN
 	*/
 	( x: number, mu: number, sigma: number ): number;
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/lib/main.js
index 250829c88366..37506019a689 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/lognormal/cdf/lib/main.js
@@ -54,6 +54,11 @@ var ln = require( '@stdlib/math/base/special/ln' );
 * @example
 * var y = cdf( NaN, 0.0, 1.0 );
 * // returns NaN
+*
+* @example
+* // Negative scale parameter:
+* var y = cdf( 2.0, 0.0, -1.0 );
+* // returns NaN
 */
 function cdf( x, mu, sigma ) {
 	if (