diff --git a/include/polarssl/ecp.h b/include/polarssl/ecp.h
index eef445f..ef99351 100644
--- a/include/polarssl/ecp.h
+++ b/include/polarssl/ecp.h
@@ -642,7 +642,7 @@
  * \param pub       Keypair structure holding a public key
  * \param prv       Keypair structure holding a private (plus public) key
  *
- * \return          0 if successfull (keys are valid and match), or
+ * \return          0 if successful (keys are valid and match), or
  *                  POLARSSL_ERR_ECP_BAD_INPUT_DATA, or
  *                  a POLARSSL_ERR_ECP_XXX or POLARSSL_ERR_MPI_XXX code.
  */