diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index f78e61b..21bede7 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -506,9 +506,14 @@
 #error "MBEDTLS_PSA_CRYPTO_SPM defined, but not all prerequisites"
 #endif
 
+#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C) && defined(MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C)
+#error "Only one of MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C or MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C can be defined"
+#endif
+
 #if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) &&            \
-    !( defined(MBEDTLS_PSA_CRYPTO_C) &&           \
-       defined(MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C) )
+    !( defined(MBEDTLS_PSA_CRYPTO_C) &&                 \
+       ( defined(MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C) ||  \
+         defined(MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C) ) )
 #error "MBEDTLS_PSA_CRYPTO_STORAGE_C defined, but not all prerequisites"
 #endif
 
@@ -518,6 +523,11 @@
 #error "MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C defined, but not all prerequisites"
 #endif
 
+#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C) &&             \
+    ! defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
+#error "MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C defined, but not all prerequisites"
+#endif
+
 #if defined(MBEDTLS_RSA_C) && ( !defined(MBEDTLS_BIGNUM_C) ||         \
     !defined(MBEDTLS_OID_C) )
 #error "MBEDTLS_RSA_C defined, but not all prerequisites"
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 2190ac5..b2a9a2e 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2623,7 +2623,9 @@
  *
  * Module:  library/psa_crypto_storage.c
  *
- * Requires: MBEDTLS_PSA_CRYPTO_C, MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C
+ * Requires: MBEDTLS_PSA_CRYPTO_C and one of either
+ * MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C or MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C
+ * (but not both)
  *
  */
 #define MBEDTLS_PSA_CRYPTO_STORAGE_C
@@ -2642,6 +2644,19 @@
 #define MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C
 
 /**
+ * \def MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C
+ *
+ * Enable persistent key storage over PSA ITS for the
+ * Platform Security Architecture cryptography API.
+ *
+ * Module:  library/psa_crypto_storage_its.c
+ *
+ * Requires: MBEDTLS_PSA_CRYPTO_C, MBEDTLS_PSA_HAS_ITS_IO
+ *
+ */
+//#define MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C
+
+/**
  * \def MBEDTLS_RIPEMD160_C
  *
  * Enable the RIPEMD-160 hash algorithm.