diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index ca42adf..82b1fd0 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -88,7 +88,7 @@
  *             mbedtls_platform_gmtime_r() supplied by the user at compile time.
  *
  * \param tt     Pointer to an object containing time (in seconds) since the
- *               Epoc to be converted
+ *               epoch to be converted
  * \param tm_buf Pointer to an object where the results will be stored
  *
  * \return      Pointer to an object of type struct tm on success, otherwise
diff --git a/include/mbedtls/threading.h b/include/mbedtls/threading.h
index 2ec41a4..6830bb4 100644
--- a/include/mbedtls/threading.h
+++ b/include/mbedtls/threading.h
@@ -25,7 +25,7 @@
 #define MBEDTLS_THREADING_H
 
 /*
- * Ensure gmtime_r is available even with -std=c99; must be included before
+ * Ensure gmtime_r is available even with -std=c99; must be defined before
  * config.h, which pulls in glibc's features.h. Harmless on other platforms.
  */
 #if !defined(_POSIX_C_SOURCE)
diff --git a/library/platform_util.c b/library/platform_util.c
index 8bd53c6..f2f83e6 100644
--- a/library/platform_util.c
+++ b/library/platform_util.c
@@ -21,7 +21,7 @@
  */
 
 /*
- * Ensure gmtime_r is available even with -std=c99; must be included before
+ * Ensure gmtime_r is available even with -std=c99; must be defined before
  * config.h, which pulls in glibc's features.h. Harmless on other platforms.
  */
 #if !defined(_POSIX_C_SOURCE)
diff --git a/library/threading.c b/library/threading.c
index 3abb17c..e7c8d98 100644
--- a/library/threading.c
+++ b/library/threading.c
@@ -20,7 +20,7 @@
  */
 
 /*
- * Ensure gmtime_r is available even with -std=c99; must be included before
+ * Ensure gmtime_r is available even with -std=c99; must be defined before
  * config.h, which pulls in glibc's features.h. Harmless on other platforms.
  */
 #if !defined(_POSIX_C_SOURCE)