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-rw-r--r--docs/USAGE.md5
-rw-r--r--docs/box64.pod7
2 files changed, 12 insertions, 0 deletions
diff --git a/docs/USAGE.md b/docs/USAGE.md
index 30a633fc..c344e4e1 100644
--- a/docs/USAGE.md
+++ b/docs/USAGE.md
@@ -231,6 +231,11 @@ Handling of x87 80bits long double
 * 0 : Try to handle 80bits long double as precise as possible (Default)

 * 1 : Handle them as double

 

+#### BOX64_SYNC_ROUNDING *

+Box64 will sync rounding mode with fesetround/fegetround.

+* 0 : Disable rounding mode syncing. (Default.)

+* 1 : Enable rounding mode syncing.

+

 #### BOX64_LIBCEF *

 Detect libcef and apply malloc_hack settings

 * 0 : Don't detect libcef

diff --git a/docs/box64.pod b/docs/box64.pod
index b5c89f58..e8a2cf30 100644
--- a/docs/box64.pod
+++ b/docs/box64.pod
@@ -371,6 +371,13 @@ Handling of x87 80bits long double
     * 0 : Try to handle 80bits long double as precise as possible (Default)
     * 1 : Handle them as double
 
+=item B<BOX64_SYNC_ROUNDING>=I<0|1>
+
+Box64 will sync rounding mode with fesetround/fegetround.
+
+    * 0 : Disable rounding mode syncing. (Default.)
+    * 1 : Enable rounding mode syncing.
+
 =item B<BOX64_LIBCEF>=I<0|1>
 
 Detect libcef and apply malloc_hack settings