diff --git a/Common.mk b/Common.mk
index 501f582..fd775e7 100644
--- a/Common.mk
+++ b/Common.mk
@@ -57,8 +57,8 @@ else
     endif
     ifeq ($(UNAME_S),Darwin)
         CURRENT_OS = MAC
-        ifeq (, $(shell which ggrep))
-            echo $(info Using macOS BSD grep, please install GNU grep to avoid warnings)
+        ifeq (, $(shell which gggrep))
+            $(info Using macOS BSD grep, please install GNU grep to avoid warnings)
             GREP_CMD = grep
         else
             GREP_CMD = ggrep
diff --git a/README.md b/README.md
index 68a4ae3..fae6d24 100644
--- a/README.md
+++ b/README.md
@@ -298,7 +298,7 @@ The makefile can autodetect the libraries that are included from your sketch and
 
 ## avrdude
 
-To upload compiled files, `avrdude` is used. This Makefile tries to find `avrdude` and it's config (`avrdude.conf`) below `ARDUINO_DIR`. If you like to use the one installed on your system instead of the one which came with Arduino, you can try to set the variables `AVRDUDE` and `AVRDUDE_CONF`. On a typical Linux system these could be set to
+To upload compiled files, `avrdude` is used. This Makefile tries to find `avrdude` and its config (`avrdude.conf`) below `ARDUINO_DIR`. If you like to use the one installed on your system instead of the one which came with Arduino, you can try to set the variables `AVRDUDE` and `AVRDUDE_CONF`. On a typical Linux system these could be set to
 
 ```make
       AVRDUDE      = /usr/bin/avrdude