diff --git a/src/emu/gamedrv.h b/src/emu/gamedrv.h
index eba153e3410..38f46a40bd2 100644
--- a/src/emu/gamedrv.h
+++ b/src/emu/gamedrv.h
@@ -116,7 +116,7 @@ constexpr u64 MACHINE_IS_SKELETON_MECHANICAL    = MACHINE_IS_SKELETON | MACHINE_
 
 /// \brief Static system description
 ///
-/// A plain data structure providing static information about an system.
+/// A plain data structure providing static information about a system.
 /// Used to allow multiple systems to be implemented using a single
 /// system device class (an implementation of #driver_device).
 class game_driver
@@ -128,7 +128,7 @@ public:
 	/// \brief Get unemulated system features
 	///
 	/// Converts system flags corresponding to unemulated device
-	/// features to the a device feature type bit field.
+	/// features to a device feature type bit field.
 	/// \param [in] flags A system flags bit field.
 	/// \return A device feature type bit field corresponding to
 	///   unemulated features declared in the \p flags argument.
@@ -145,7 +145,7 @@ public:
 	/// \brief Get imperfectly emulated system features
 	///
 	/// Converts system flags corresponding to imperfectly emulated
-	/// device features to the a device feature type bit field.
+	/// device features to a device feature type bit field.
 	/// \param [in] flags A system flags bit field.
 	/// \return A device feature type bit field corresponding to
 	///   imperfectly emulated features declared in the \p flags
diff --git a/src/lib/util/ioprocs.h b/src/lib/util/ioprocs.h
index 0a4e5c384f0..f2826273c5d 100644
--- a/src/lib/util/ioprocs.h
+++ b/src/lib/util/ioprocs.h
@@ -151,7 +151,7 @@ public:
 	/// \brief Get the length of the stream
 	///
 	/// Gets the current length of the stream.
-	/// \param [out] result The lenght of the stream in bytes.  Not
+	/// \param [out] result The length of the stream in bytes.  Not
 	///   valid if the operation fails.
 	/// \return An error condtion if the operation failed.
 	virtual std::error_condition length(std::uint64_t &result) noexcept = 0;
@@ -160,7 +160,7 @@ public:
 
 /// \brief Interface to a random-access byte input sequence
 ///
-/// Provides an interface for reading from aritrary positions within a
+/// Provides an interface for reading from arbitrary positions within a
 /// byte sequence.  No further structure is provided.
 /// \sa read_stream random_write random_read_write
 class random_read : public virtual read_stream, public virtual random_access