diff --git a/ChangeLog b/ChangeLog
index 3697f53..b24b2d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -88,7 +88,7 @@
      length of an X.509 verification chain.
    * Support for renegotiation can now be disabled at compile-time
    * Support for 1/n-1 record splitting, a countermeasure against BEAST.
-   * Certificate selection based on signature hash, prefering SHA-1 over SHA-2
+   * Certificate selection based on signature hash, preferring SHA-1 over SHA-2
      for pre-1.2 clients when multiple certificates are available.
    * Add support for getrandom() syscall on recent Linux kernels with Glibc or
      a compatible enough libc (eg uClibc).
diff --git a/README.rst b/README.rst
index ae335f8..59ca2c6 100644
--- a/README.rst
+++ b/README.rst
@@ -68,7 +68,7 @@
 - ASanDbg.
   Same as ASan but slower, with debug information and better stack traces.
 - MemSan.
-  This intruments the code with MemorySanitizer to check for uninitialised
+  This instruments the code with MemorySanitizer to check for uninitialised
   memory reads. Experimental, needs recent clang on Linux/x86_64.
 - MemSanDbg.
   Same as ASan but slower, with debug information, better stack traces and
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.
  */
diff --git a/include/polarssl/platform.h b/include/polarssl/platform.h
index 32d1c9f..9095203 100644
--- a/include/polarssl/platform.h
+++ b/include/polarssl/platform.h
@@ -30,7 +30,7 @@
 #include POLARSSL_CONFIG_FILE
 #endif
 
-/* Temporary compability hack for to keep MEMORY_C working */
+/* Temporary compatibility hack for to keep MEMORY_C working */
 #if defined(POLARSSL_MEMORY_C) && !defined(POLARSSL_PLATFORM_MEMORY)
 #define POLARSSL_PLATFORM_MEMORY
 #endif
diff --git a/programs/pkey/mpi_demo.c b/programs/pkey/mpi_demo.c
index c94fb97..95267fc 100644
--- a/programs/pkey/mpi_demo.c
+++ b/programs/pkey/mpi_demo.c
@@ -96,7 +96,7 @@
 
     if( ret != 0 )
     {
-        polarssl_printf( "\nAn error occured.\n" );
+        polarssl_printf( "\nAn error occurred.\n" );
         ret = 1;
     }
 
diff --git a/scripts/ecc-heap.sh b/scripts/ecc-heap.sh
index 4f88a44..8c53f09 100755
--- a/scripts/ecc-heap.sh
+++ b/scripts/ecc-heap.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Measure heap usage (and perfomance) of ECC operations with various values of
+# Measure heap usage (and performance) of ECC operations with various values of
 # the relevant tunable compile-time parameters.
 #
 # Usage (preferably on a 32-bit platform):
diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index 3022aae..2077f3a 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -73,7 +73,7 @@
 Signing CA in parentheses (same meaning as certificates).
 
 - crl-ec-sha*: (2) server6.crt
-- crl-future.pem: (2) server6.crt + unkown
+- crl-future.pem: (2) server6.crt + unknown
 - crl-rsa-pss-*.pem: (1) server9{,badsign,with-ca}.crt + cert_sha384.crt + unknown
 - crl.pem, crl_expired.pem: (1) server1{,.cert_type,.key_usage,.v1}.crt + unknown
 - crl_md*.pem: crl_sha*.pem: (1) same as crl.pem