diff --git a/OscMacroDefinitions.py b/OscMacroDefinitions.py
index bd1f7cd..f6fb8fa 100644
--- a/OscMacroDefinitions.py
+++ b/OscMacroDefinitions.py
@@ -100,6 +100,13 @@ class HogDevice():
                 self.osc.button_press(ctx.device,
                                       "/hog/hardware/pause/" + master)
 
+    def _master_assert(self, ctx):
+        if (len(ctx.master.targets) != 0):
+            logger.error("ERROR: limited to asserting current master only.")
+            return
+        logger.info("ASSERT on current master.")
+        self.osc.button_press(ctx.device, "/hog/hardware/assert")
+
     def _master_fade(self, ctx):
         if (ctx.number) is None:
             logger.error("ERROR: Missing required argument for LEVEL")
@@ -186,6 +193,7 @@ class HogDevice():
 
     command = {"GM":  _master_go,
                "HM":  _master_halt,
+               "AM":  _master_assert,
                "FM":  _master_fade,
                "FGM": _master_fade_grand,
                "CM":  _master_choose,
diff --git a/README.md b/README.md
index ba2887d..bdddfe1 100644
--- a/README.md
+++ b/README.md
@@ -65,7 +65,7 @@ Only features that are supported in both OSC and Comment Macros are able to be i
 |-------|----------|-----------|-------|
 | GM | Go Master | Yes | |
 | HM | Halt Master | Yes | |
-| AM | Assert Master | no | |
+| AM | Assert Master | Yes | on current master only |
 | RM | Release Master | no | |
 | RA | Relase All | Yes | |
 | RO | Release Others | no | |