diff --git a/docs/4.0-migration-guide/error-codes.md b/docs/4.0-migration-guide/error-codes.md
index ca62025..8cc7098 100644
--- a/docs/4.0-migration-guide/error-codes.md
+++ b/docs/4.0-migration-guide/error-codes.md
@@ -12,7 +12,7 @@
 
 Generally, functions that used to return the sum of two error codes now return the low-level code. However, as before, the exact error code returned in a given scenario can change without notice unless the condition is specifically described in the function's documentation and no other condition is applicable.
 
-As a consequence, the functions `mbedtls_low_level_sterr()` and `mbedtls_high_level_strerr()` no longer exist.
+As a consequence, the functions `mbedtls_low_level_strerr()` and `mbedtls_high_level_strerr()` no longer exist.
 
 ### Removed error code names