diff --git a/include/mbedtls/cmac.h b/include/mbedtls/cmac.h
index 5a59f90d6..5a09761c2 100644
--- a/include/mbedtls/cmac.h
+++ b/include/mbedtls/cmac.h
@@ -27,7 +27,7 @@
 
 #define MBEDTLS_ERR_CMAC_BAD_INPUT      -0x0011 /**< Bad input parameters to function. */
 #define MBEDTLS_ERR_CMAC_VERIFY_FAILED  -0x0013 /**< Verification failed. */
-#define MBEDTLS_ERR_CMAC_ALLOC_FAILED   -0x0015 /**< Memory Allocation failed. */
+#define MBEDTLS_ERR_CMAC_ALLOC_FAILED   -0x0015 /**< Failed to allocate memory */
 
 
 #ifdef __cplusplus