diff --git a/libc/bionic/system_property_api.cpp b/libc/bionic/system_property_api.cpp
index 10d1bb3..051bc4c 100644
--- a/libc/bionic/system_property_api.cpp
+++ b/libc/bionic/system_property_api.cpp
@@ -48,8 +48,6 @@
   return system_properties.Init(PROP_FILENAME) ? 0 : -1;
 }
 
-// This was previously for testing, but now that SystemProperties is its own testable class,
-// there is never a reason to call this function.
 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
 int __system_property_set_filename(const char*) {
   return -1;
diff --git a/libc/include/sys/_system_properties.h b/libc/include/sys/_system_properties.h
index 67beb9a..744a45b 100644
--- a/libc/include/sys/_system_properties.h
+++ b/libc/include/sys/_system_properties.h
@@ -58,8 +58,8 @@
 #define PROP_ERROR_SET_FAILED 0x0024
 
 /*
-** Map the property area from the specified filename.  This
-** method is for testing only.
+** This was previously for testing, but now that SystemProperties is its own testable class,
+** there is never a reason to call this function and its implementation simply returns -1.
 */
 int __system_property_set_filename(const char* __filename);