diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 0c3888987..57bbfeb6e 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -74,7 +74,7 @@
  * MD4       1                  0x002D-0x002D
  * MD5       1                  0x002F-0x002F
  * RIPEMD160 1                  0x0031-0x0031
- * SHA1      1                  0x0035-0x0035
+ * SHA1      1                  0x0035-0x0035 0x0073-0x0073
  * SHA256    1                  0x0037-0x0037
  * SHA512    1                  0x0039-0x0039
  * CHACHA20  3                  0x0051-0x0055
diff --git a/library/error.c b/library/error.c
index eabee9e21..564490e58 100644
--- a/library/error.c
+++ b/library/error.c
@@ -855,6 +855,8 @@ void mbedtls_strerror( int ret, char *buf, size_t buflen )
 #if defined(MBEDTLS_SHA1_C)
     if( use_ret == -(MBEDTLS_ERR_SHA1_HW_ACCEL_FAILED) )
         mbedtls_snprintf( buf, buflen, "SHA1 - SHA-1 hardware accelerator failed" );
+    if( use_ret == -(MBEDTLS_ERR_SHA1_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "SHA1 - Invalid input data" );
 #endif /* MBEDTLS_SHA1_C */
 
 #if defined(MBEDTLS_SHA256_C)