diff --git a/lib/node_modules/@stdlib/math/base/assert/is-negative-finite/README.md b/lib/node_modules/@stdlib/math/base/assert/is-negative-finite/README.md
index 265cb945a0e..6421879b658 100644
--- a/lib/node_modules/@stdlib/math/base/assert/is-negative-finite/README.md
+++ b/lib/node_modules/@stdlib/math/base/assert/is-negative-finite/README.md
@@ -81,6 +81,98 @@ bool = isNegativeFinite( NaN );
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+* * *
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+
+## C APIs
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+### Usage
+
+```c
+#include "stdlib/math/base/assert/is_negative_finite.h"
+```
+
+#### stdlib_base_is_negative_finite( x )
+
+Tests if a double-precision floating-point numeric value is a negative finite number.
+
+```c
+#include
+
+bool out = stdlib_base_is_negative_finite( 1.0 );
+// returns false
+
+out = stdlib_base_is_negative_finite( -4.0 );
+// returns true
+```
+
+The function accepts the following arguments:
+
+- **x**: `[in] double` input value.
+
+```c
+bool stdlib_base_is_negative_finite( const double x );
+```
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+### Examples
+
+```c
+#include "stdlib/math/base/assert/is_negative_finite.h"
+#include "stdlib/constants/float64/ninf.h"
+#include
+#include
+
+int main( void ) {
+ const double x[] = { 5.0, -5.0, 3.14, -3.14, 0.0/0.0, STDLIB_CONSTANT_FLOAT64_NINF };
+
+ bool b;
+ int i;
+ for ( i = 0; i < 6; i++ ) {
+ b = stdlib_base_is_negative_finite( x[ i ] );
+ printf( "x = %lf, is_negative_finite(x) = %s\n", x[ i ], ( b ) ? "True" : "False" );
+ }
+}
+```
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