diff --git a/include/wx/mac/setup0.h b/include/wx/mac/setup0.h
index d3a28ed957..adaa078b0b 100644
--- a/include/wx/mac/setup0.h
+++ b/include/wx/mac/setup0.h
@@ -1043,7 +1043,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //
diff --git a/include/wx/motif/setup0.h b/include/wx/motif/setup0.h
index d4fa16afac..cf7f25a09e 100644
--- a/include/wx/motif/setup0.h
+++ b/include/wx/motif/setup0.h
@@ -1042,7 +1042,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //
diff --git a/include/wx/msw/setup0.h b/include/wx/msw/setup0.h
index e2133de048..7ac1b7192d 100644
--- a/include/wx/msw/setup0.h
+++ b/include/wx/msw/setup0.h
@@ -1042,7 +1042,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //
diff --git a/include/wx/msw/wince/setup.h b/include/wx/msw/wince/setup.h
index 22c30933f0..7800c6b66d 100644
--- a/include/wx/msw/wince/setup.h
+++ b/include/wx/msw/wince/setup.h
@@ -1042,7 +1042,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //
diff --git a/include/wx/os2/setup0.h b/include/wx/os2/setup0.h
index 985a20e9c4..f79469830f 100644
--- a/include/wx/os2/setup0.h
+++ b/include/wx/os2/setup0.h
@@ -1042,7 +1042,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //
diff --git a/include/wx/palmos/setup0.h b/include/wx/palmos/setup0.h
index e57ca006a1..b96336a348 100644
--- a/include/wx/palmos/setup0.h
+++ b/include/wx/palmos/setup0.h
@@ -1042,7 +1042,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //
diff --git a/include/wx/setup_inc.h b/include/wx/setup_inc.h
index 18ec6398fc..5cafe43609 100644
--- a/include/wx/setup_inc.h
+++ b/include/wx/setup_inc.h
@@ -1038,7 +1038,7 @@
 // ----------------------------------------------------------------------------
 
 // wxSingleInstanceChecker class allows to verify at startup if another program
-// instance is running (it is only available under Win32)
+// instance is running.
 //
 // Default is 1
 //