diff --git a/include/wx/mac/setup0.h b/include/wx/mac/setup0.h
index 6b0bd34b11..e9d5f8f823 100644
--- a/include/wx/mac/setup0.h
+++ b/include/wx/mac/setup0.h
@@ -1105,7 +1105,7 @@
 // ----------------------------------------------------------------------------
 
 // 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 eceb880441..0489e37064 100644
--- a/include/wx/motif/setup0.h
+++ b/include/wx/motif/setup0.h
@@ -1104,7 +1104,7 @@
 // ----------------------------------------------------------------------------
 
 // 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 66131ee64f..81723aace5 100644
--- a/include/wx/msw/setup0.h
+++ b/include/wx/msw/setup0.h
@@ -1104,7 +1104,7 @@
 // ----------------------------------------------------------------------------
 
 // 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 04d2d81649..ff08abc677 100644
--- a/include/wx/msw/wince/setup.h
+++ b/include/wx/msw/wince/setup.h
@@ -1104,7 +1104,7 @@
 // ----------------------------------------------------------------------------
 
 // 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 c8350fae1d..63d275f346 100644
--- a/include/wx/os2/setup0.h
+++ b/include/wx/os2/setup0.h
@@ -1104,7 +1104,7 @@
 // ----------------------------------------------------------------------------
 
 // 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 1dde2f6d16..290ebbe819 100644
--- a/include/wx/palmos/setup0.h
+++ b/include/wx/palmos/setup0.h
@@ -1104,7 +1104,7 @@
 // ----------------------------------------------------------------------------
 
 // 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 500e3b10c0..614d3075ee 100644
--- a/include/wx/setup_inc.h
+++ b/include/wx/setup_inc.h
@@ -1100,7 +1100,7 @@
 // ----------------------------------------------------------------------------
 
 // 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
 //