diff --git a/include/polarssl/rsa.h b/include/polarssl/rsa.h
index 21109ed..b1354d1 100644
--- a/include/polarssl/rsa.h
+++ b/include/polarssl/rsa.h
@@ -43,7 +43,7 @@
 #define POLARSSL_ERR_RSA_BAD_INPUT_DATA                    -0x4080  /**< Bad input parameters to function. */
 #define POLARSSL_ERR_RSA_INVALID_PADDING                   -0x4100  /**< Input data contains invalid padding and is rejected. */
 #define POLARSSL_ERR_RSA_KEY_GEN_FAILED                    -0x4180  /**< Something failed during generation of a key. */
-#define POLARSSL_ERR_RSA_KEY_CHECK_FAILED                  -0x4200  /**< Key failed to pass the libraries validity check. */
+#define POLARSSL_ERR_RSA_KEY_CHECK_FAILED                  -0x4200  /**< Key failed to pass the library's validity check. */
 #define POLARSSL_ERR_RSA_PUBLIC_FAILED                     -0x4280  /**< The public key operation failed. */
 #define POLARSSL_ERR_RSA_PRIVATE_FAILED                    -0x4300  /**< The private key operation failed. */
 #define POLARSSL_ERR_RSA_VERIFY_FAILED                     -0x4380  /**< The PKCS#1 verification failed. */