diff --git a/cpu.h b/cpu.h
index 220eedfd..972cf3bc 100644
--- a/cpu.h
+++ b/cpu.h
@@ -606,7 +606,7 @@ void CRYPTOPP_API DetectPowerpcFeatures();
 
 /// \brief Determine if a PowerPC processor has Altivec available
 /// \returns true if the hardware is capable of Altivec at runtime, false otherwise.
-/// \details Altivec instructions are available under most modern PowerPCs.
+/// \details Altivec instructions are available on modern PowerPCs.
 /// \details Runtime support requires compile time support. When compiling with GCC, you may
 ///   need to compile with <tt>-mcpu=power4</tt>; while IBM XL C/C++ compilers require
 ///   <tt>-qarch=pwr6 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.
@@ -623,7 +623,6 @@ inline bool HasAltivec()
 
 /// \brief Determine if a PowerPC processor has Power7 available
 /// \returns true if the hardware is capable of Power7 at runtime, false otherwise.
-/// \details Altivec instructions are available under most modern PowerPCs.
 /// \details Runtime support requires compile time support. When compiling with GCC, you may
 ///   need to compile with <tt>-mcpu=power7</tt>; while IBM XL C/C++ compilers require
 ///   <tt>-qarch=pwr7 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.
@@ -640,7 +639,6 @@ inline bool HasPower7()
 
 /// \brief Determine if a PowerPC processor has Power8 available
 /// \returns true if the hardware is capable of Power8 at runtime, false otherwise.
-/// \details Altivec instructions are available under most modern PowerPCs.
 /// \details Runtime support requires compile time support. When compiling with GCC, you may
 ///   need to compile with <tt>-mcpu=power8</tt>; while IBM XL C/C++ compilers require
 ///   <tt>-qarch=pwr8 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.
@@ -657,7 +655,6 @@ inline bool HasPower8()
 
 /// \brief Determine if a PowerPC processor has Power9 available
 /// \returns true if the hardware is capable of Power9 at runtime, false otherwise.
-/// \details Altivec instructions are available under most modern PowerPCs.
 /// \details Runtime support requires compile time support. When compiling with GCC, you may
 ///   need to compile with <tt>-mcpu=power9</tt>; while IBM XL C/C++ compilers require
 ///   <tt>-qarch=pwr9 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.
@@ -730,7 +727,6 @@ inline bool HasSHA512()
 
 /// \brief Determine if a PowerPC processor has DARN available
 /// \returns true if the hardware is capable of DARN at runtime, false otherwise.
-/// \details Altivec instructions are available under most modern PowerPCs.
 /// \details Runtime support requires compile time support. When compiling with GCC, you may
 ///   need to compile with <tt>-mcpu=power9</tt>; while IBM XL C/C++ compilers require
 ///   <tt>-qarch=pwr9 -qaltivec</tt>. Also see PowerPC's <tt>_ALTIVEC_</tt> preprocessor macro.