diff --git a/include/mbedtls/bignum.h b/include/mbedtls/bignum.h
index 7b80838..141a8e9 100644
--- a/include/mbedtls/bignum.h
+++ b/include/mbedtls/bignum.h
@@ -196,7 +196,7 @@
 void mbedtls_mpi_init( mbedtls_mpi *X );
 
 /**
- * \brief          This function frees the components an MPI context.
+ * \brief          This function frees the components of an MPI context.
  *
  * \param X        The MPI context to be cleared. This may be \c NULL,
  *                 in which case this function is a no-op. If it is
@@ -693,7 +693,7 @@
  * \param R        The destination MPI for the remainder value.
  *                 This may be \c NULL if the value of the
  *                 remainder is not needed.
- * \param A        The divident. This must point to an initialized MPi.
+ * \param A        The dividend. This must point to an initialized MPi.
  * \param B        The divisor. This must point to an initialized MPI.
  *
  * \return         \c 0 if successful.
@@ -714,7 +714,7 @@
  * \param R        The destination MPI for the remainder value.
  *                 This may be \c NULL if the value of the
  *                 remainder is not needed.
- * \param A        The divident. This must point to an initialized MPi.
+ * \param A        The dividend. This must point to an initialized MPi.
  * \param b        The divisor.
  *
  * \return         \c 0 if successful.
@@ -776,7 +776,7 @@
  * \param _RR      A helper MPI depending solely on \p N which can be used to
  *                 speed-up multiple modular exponentiations for the same value
  *                 of \p N. This may be \c NULL. If it is not \c NULL, it must
- *                 point an initialized MPI. If it hasn't been used after
+ *                 point to an initialized MPI. If it hasn't been used after
  *                 the call to mbedtls_mpi_init(), this function will compute
  *                 the helper value and store it in \p _RR for reuse on
  *                 subsequent calls to this function. Otherwise, the function
diff --git a/library/bignum.c b/library/bignum.c
index 8b01bad..0d0d922 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -724,7 +724,7 @@
     size_t i, j;
     size_t const limbs = CHARS_TO_LIMBS( buflen );
 
-    MPI_VALIDATE_RET( X   != NULL );
+    MPI_VALIDATE_RET( X != NULL );
     MPI_VALIDATE_RET( buflen == 0 || buf != NULL );
 
     /* Ensure that target MPI has exactly the necessary number of limbs */
@@ -2009,7 +2009,7 @@
 {
     int ret;
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
-    MPI_VALIDATE_RET( X != NULL );
+    MPI_VALIDATE_RET( X     != NULL );
     MPI_VALIDATE_RET( f_rng != NULL );
 
     if( size > MBEDTLS_MPI_MAX_SIZE )
@@ -2192,7 +2192,7 @@
     size_t i, j, k, s;
     mbedtls_mpi W, R, T, A, RR;
 
-    MPI_VALIDATE_RET( X != NULL );
+    MPI_VALIDATE_RET( X     != NULL );
     MPI_VALIDATE_RET( f_rng != NULL );
 
     mbedtls_mpi_init( &W ); mbedtls_mpi_init( &R );
@@ -2284,7 +2284,7 @@
 {
     int ret;
     mbedtls_mpi XX;
-    MPI_VALIDATE_RET( X != NULL );
+    MPI_VALIDATE_RET( X     != NULL );
     MPI_VALIDATE_RET( f_rng != NULL );
 
     XX.s = 1;
@@ -2317,7 +2317,7 @@
                   int (*f_rng)(void *, unsigned char *, size_t),
                   void *p_rng )
 {
-    MPI_VALIDATE_RET( X != NULL );
+    MPI_VALIDATE_RET( X     != NULL );
     MPI_VALIDATE_RET( f_rng != NULL );
 
     /*
@@ -2353,7 +2353,7 @@
     mbedtls_mpi_uint r;
     mbedtls_mpi Y;
 
-    MPI_VALIDATE_RET( X != NULL );
+    MPI_VALIDATE_RET( X     != NULL );
     MPI_VALIDATE_RET( f_rng != NULL );
 
     if( nbits < 3 || nbits > MBEDTLS_MPI_MAX_BITS )