diff --git a/wolfcrypt/src/ecc.c b/wolfcrypt/src/ecc.c
index 9c81e7083..c7b8415b0 100644
--- a/wolfcrypt/src/ecc.c
+++ b/wolfcrypt/src/ecc.c
@@ -6231,7 +6231,7 @@ int wc_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
    word32 msgLenInBytes = hashlen;
    CRYS_ECPKI_HASH_OpMode_t hash_mode;
 #elif defined(WOLFSSL_SILABS_SE_ACCEL)
-   byte sigRS[ECC_MAX_CRYPTO_HW_SIZE * 4];
+   byte sigRS[ECC_MAX_CRYPTO_HW_SIZE * 2];
 #elif !defined(WOLFSSL_SP_MATH) || defined(FREESCALE_LTC_ECC)
    int          did_init = 0;
    ecc_point    *mG = NULL, *mQ = NULL;
diff --git a/wolfcrypt/src/port/silabs/README.md b/wolfcrypt/src/port/silabs/README.md
index 7c92067ad..d6d0f782b 100644
--- a/wolfcrypt/src/port/silabs/README.md
+++ b/wolfcrypt/src/port/silabs/README.md
@@ -29,6 +29,12 @@ Update was preformed under Simplicity Studio directory:
    versions requesting too much data or too quickly may result in
    system reset and setting `SESYSREQ`.
 
+### Multi-threading
+
+The SE manager supports multi-threading for FreeRTOS and Micrium
+([ref](https://docs.silabs.com/gecko-platform/latest/service/api/group-sl-se-manager#autotoc-md152)).
+If a different OS is used with multi-threading, additional mutex
+protection may be necessary.
 
 ## Benchmarks
 
diff --git a/wolfssl/wolfcrypt/ecc.h b/wolfssl/wolfcrypt/ecc.h
index 97b070ea2..777aa0e4d 100644
--- a/wolfssl/wolfcrypt/ecc.h
+++ b/wolfssl/wolfcrypt/ecc.h
@@ -404,6 +404,10 @@ struct ecc_key {
 #ifdef WOLFSSL_SILABS_SE_ACCEL
     sl_se_command_context_t  cmd_ctx;
     sl_se_key_descriptor_t   key;
+    /* Used for SiLabs "plaintext" with public X, public Y, and
+     * private D concatenated. These are respectively at offset `0`,
+     * offset `keysize`, and offset `2 * keysize`.
+     */
     byte key_raw[3 * ECC_MAX_CRYPTO_HW_SIZE];
 #endif