diff --git a/include/openthread/commissioner.h b/include/openthread/commissioner.h
index 8ff811e08..42d3cced0 100644
--- a/include/openthread/commissioner.h
+++ b/include/openthread/commissioner.h
@@ -116,7 +116,7 @@ typedef struct otCommissioningDataset
 #define OT_JOINER_MAX_PSKD_LENGTH 32 ///< Maximum string length of a Joiner PSKd (does not include null char).
 
 /**
- * This structure represent a Joiner PSKd.
+ * This structure represents a Joiner PSKd.
  *
  */
 typedef struct otJoinerPskd
diff --git a/include/openthread/instance.h b/include/openthread/instance.h
index 3189be0c6..ee0eb45a9 100644
--- a/include/openthread/instance.h
+++ b/include/openthread/instance.h
@@ -53,7 +53,7 @@ extern "C" {
  * @note This number versions both OpenThread platform and user APIs.
  *
  */
-#define OPENTHREAD_API_VERSION (10)
+#define OPENTHREAD_API_VERSION (11)
 
 /**
  * @addtogroup api-instance
diff --git a/include/openthread/joiner.h b/include/openthread/joiner.h
index 85df654cd..adb10b221 100644
--- a/include/openthread/joiner.h
+++ b/include/openthread/joiner.h
@@ -171,7 +171,7 @@ const otExtAddress *otJoinerGetId(otInstance *aInstance);
  * @param[in]   aDiscerner   A pointer to a Joiner Discerner. If NULL clears any previously set discerner.
  *
  * @retval OT_ERROR_NONE           The Joiner Discerner updated successfully.
- * @retval OT_ERROR_INVALID_ARGS   @p aDisciminrator is not valid (specified length is not within valid range).
+ * @retval OT_ERROR_INVALID_ARGS   @p aDiscerner is not valid (specified length is not within valid range).
  * @retval OT_ERROR_INVALID_STATE  There is an ongoing Joining process so Joiner Discerner could not be changed.
  *
  */
diff --git a/src/core/meshcop/joiner.hpp b/src/core/meshcop/joiner.hpp
index 8078915df..0e5a4e87a 100644
--- a/src/core/meshcop/joiner.hpp
+++ b/src/core/meshcop/joiner.hpp
@@ -130,7 +130,7 @@ public:
      * @param[in]   aDiscerner  A Joiner Discerner
      *
      * @retval OT_ERROR_NONE           The Joiner Discerner updated successfully.
-     * @retval OT_ERROR_INVALID_ARGS   @p aDisciminrator is not valid (specified length is not within valid range).
+     * @retval OT_ERROR_INVALID_ARGS   @p aDiscerner is not valid (specified length is not within valid range).
      * @retval OT_ERROR_INVALID_STATE  There is an ongoing Joining process so Joiner Discerner could not be changed.
      *
      */
diff --git a/src/core/meshcop/meshcop.hpp b/src/core/meshcop/meshcop.hpp
index e8cd865ed..1c635001f 100644
--- a/src/core/meshcop/meshcop.hpp
+++ b/src/core/meshcop/meshcop.hpp
@@ -129,7 +129,7 @@ public:
     bool operator==(const JoinerPskd &aOther) const;
 
     /**
-     * This method overloads operator `!=` to evaluate whether or not two PSKds are equal.
+     * This method overloads operator `!=` to evaluate whether or not two PSKds are unequal.
      *
      * @param[in]  aOther  The other PSKd to compare with.
      *