diff --git a/lib/node_modules/@stdlib/stats/base/dists/planck/mean/README.md b/lib/node_modules/@stdlib/stats/base/dists/planck/mean/README.md
index 055f2d793ebf..decfcd16efc1 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/planck/mean/README.md
+++ b/lib/node_modules/@stdlib/stats/base/dists/planck/mean/README.md
@@ -120,6 +120,98 @@ for ( i = 0; i < 10; i++ ) {
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+* * *
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+## C APIs
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+### Usage
+
+```c
+#include "stdlib/stats/base/dists/planck/mean.h"
+```
+
+#### stdlib_base_dists_planck_mean( lambda )
+
+Returns the expected value of a Planck distribution with shape parameter `lambda`.
+
+```c
+double out = stdlib_base_dists_planck_mean( 0.1 );
+// returns ~9.5083
+```
+
+The function accepts the following arguments:
+
+- **lambda**: `[in] double` shape parameter
+
+```c
+double stdlib_base_dists_planck_mean( const double lambda );
+```
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+### Examples
+
+```c
+#include "stdlib/stats/base/dists/planck/mean.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 lambda;
+ double y;
+ int i;
+
+ for ( i = 0; i < 25; i++ ) {
+ lambda = random_uniform( 0.1, 10.0 );
+ y = stdlib_base_dists_planck_mean( lambda );
+ printf( "λ: %lf, E(X;λ): %lf\n", lambda, y );
+ }
+}
+```
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