diff --git a/docs/architecture/psa-crypto-implementation-structure.md b/docs/architecture/psa-crypto-implementation-structure.md
index 025a623..cd4d427 100644
--- a/docs/architecture/psa-crypto-implementation-structure.md
+++ b/docs/architecture/psa-crypto-implementation-structure.md
@@ -63,7 +63,7 @@
     3. Generate or copy the key material into the key slot. This entails the allocation of the buffer to store the key material.
     4. Call psa_finish_key_creation() that mostly saves persistent keys into persistent storage.
 
-In case of any error occuring at step 3 or 4, psa_fail_key_creation() is called. It wipes and cleans the slot especially the key material: reset to zero of the RAM memory that contained the key material, free the allocated buffer.
+In case of any error occurring at step 3 or 4, psa_fail_key_creation() is called. It wipes and cleans the slot especially the key material: reset to zero of the RAM memory that contained the key material, free the allocated buffer.
 
 
 ## Mbed TLS PSA Cryptography API implementation drivers