diff --git a/lib/node_modules/@stdlib/stats/base/dists/planck/cdf/README.md b/lib/node_modules/@stdlib/stats/base/dists/planck/cdf/README.md
index 877f402c385b..2eed828b58b1 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/planck/cdf/README.md
+++ b/lib/node_modules/@stdlib/stats/base/dists/planck/cdf/README.md
@@ -120,6 +120,102 @@ for ( i = 0; i < lambda.length; i++ ) {
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+## C APIs
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+### Usage
+
+```c
+#include "stdlib/stats/base/dists/planck/cdf.h"
+```
+
+#### stdlib_base_dists_planck_cdf( x, lambda)
+
+Evaluates the cumulative distribution function (CDF) for an planck distribution.
+
+```c
+double out = stdlib_base_dists_planck_cdf( 2.0, .5);
+// returns ~0.7769
+```
+
+The function accepts the following arguments:
+
+- **x**: `[in] double` input value.
+- **lambda**: `[in] double` minimum support.
+
+```c
+double stdlib_base_dists_planck_cdf( const double x, const double lambda);
+```
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+### Examples
+
+```c
+#include "stdlib/stats/base/dists/planck/cdf.h"
+#include
+#include
+
+static double random_uniform( const double min, const double max ) {
+ double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
+ return min + ( v*(max-min) );
+}
+int main(void) {
+ double x;
+ double lambda;
+ double y;
+ int i;
+
+ for (i = 0; i < 25; i++) {
+ x = random_uniform(-10.0, 10.0);
+ lambda = random_uniform(0.1, 5.0);
+ y = stdlib_base_dists_planck_cdf(x, lambda);
+ printf("x: %lf, lambda: %lf, F(x; lambda): %lf\n", x, lambda, y);
+ }
+
+ return 0;
+}
+```
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