diff --git a/lib/node_modules/@stdlib/stats/base/dists/rayleigh/pdf/README.md b/lib/node_modules/@stdlib/stats/base/dists/rayleigh/pdf/README.md
index 5c60971ddb0b..04eee12f2300 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/rayleigh/pdf/README.md
+++ b/lib/node_modules/@stdlib/stats/base/dists/rayleigh/pdf/README.md
@@ -143,6 +143,101 @@ for ( i = 0; i < 10; i++ ) {
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+## C APIs
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+### Usage
+
+```c
+#include "stdlib/stats/base/dists/rayleigh/pdf.h"
+```
+
+#### stdlib_base_dists_rayleigh_pdf( x, sigma )
+
+Evaluates the probability density function (PDF) for a Rayleigh distribution.
+
+```c
+double out = stdlib_base_dists_rayleigh_pdf( 0.3, 1.0 );
+// returns ~0.287
+```
+
+The function accepts the following arguments:
+
+- **x**: `[in] double` input value.
+- **sigma**: `[in] double` scale parameter.
+
+```c
+double stdlib_base_dists_rayleigh_pdf( const double x, const double sigma );
+```
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+### Examples
+
+```c
+#include "stdlib/stats/base/dists/rayleigh/pdf.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 sigma;
+ double x;
+ double y;
+ int i;
+
+ for ( i = 0; i < 25; i++ ) {
+ x = random_uniform( 0.0, 10.0 );
+ sigma = random_uniform( 0.0, 10.0 );
+ y = stdlib_base_dists_rayleigh_pdf( x, sigma );
+ printf( "x: %lf, σ: %lf, f(x;σ): %lf\n", x, sigma, y );
+ }
+}
+```
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