diff --git a/Makefile b/Makefile
index 28694873d966bc72414e76474c4eb7d964fa7e82..12629ca7dcffd1ce0da9c8252b557c0b8215a20d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
-MK_DESCRIPTION="This provides some additional tools for makefiles."
-MK_LICENSE="Released under the BSD two-clause license, see the LICENSE file for more information."
-MK_ASSURE="python3 ls tree clang"
+MEX_DESCRIPTION="This provides some additional tools for makefiles."
+MEX_LICENSE="Released under the BSD two-clause license, see the LICENSE file for more information."
+MEX_ASSURE="python3 ls tree clang"
 
 include makext.mk
 
diff --git a/README.md b/README.md
index 5f8fd865e6c8be78d34043c7932c4cb39e9b8f62..ada9a43ec85711062f42776102143dd97029ad47 100644
--- a/README.md
+++ b/README.md
@@ -93,22 +93,22 @@ ## Description & License information
 
 You can provide description for the project that will be displayed
 together with `help`. To do this provide this information in the
-`MK_DESCRIPTION` variable.
+`MEX_DESCRIPTION` variable.
 
 Same goes for license information. Provide this information by creating
-`MK_LICENSE` variable.
+`MEX_LICENSE` variable.
 
 If these variables are not present this information will not be displayed
 in the help.
 
 > [!IMPORTANT]
-> Variables `MK_DESCRIPTION` and `MK_LICENSE` must be defined before you
+> Variables `MEX_DESCRIPTION` and `MEX_LICENSE` must be defined before you
 > include `makext.mk` to your `Makefile`. This is needed because the way
 > GNU Make is parsing Makefiles.
 
 ```make
-MK_DESCRIPTION="This provides some additional tools for makefiles."
-MK_LICENSE="Released under the BSD two-clause license, see the LICENSE file for more information."
+MEX_DESCRIPTION="This provides some additional tools for makefiles."
+MEX_LICENSE="Released under the BSD two-clause license, see the LICENSE file for more information."
 
 include makext.mk
 
@@ -143,7 +143,7 @@ be used. If programs are missing recipes can only partially be executed
 leaving project in a potentially broken state.
 
 ```make
-MK_ASSURE="python3 ls tree clang"
+MEX_ASSURE="python3 ls tree clang"
 
 include makext.mk
 
@@ -152,7 +152,7 @@ 	@echo "Building the application..."
 ```
 
 `.assure` prerequisite will loop over the list of programs defined in
-`MK_ASSURE` variable and in case one is missing will exit `make` with
+`MEX_ASSURE` variable and in case one is missing will exit `make` with
 status code error 1. This will stop executing the recipe and therefore
 not execute anything in target `build-app`.
 
diff --git a/makext.mk b/makext.mk
index b4846c0d437706991f49b231f4e2821a677761d0..99cba0a6f41ef5122cc9ec7b33540d1b352021db 100644
--- a/makext.mk
+++ b/makext.mk
@@ -24,23 +24,23 @@ # Help extension that lists all the targets with descriptions
 # and adds description and license information if data provided.
 .PHONY: .help
 .help:
-ifdef MK_DESCRIPTION
-	@echo "$(MK_DESCRIPTION)\n" | fmt
+ifdef MEX_DESCRIPTION
+	@echo "$(MEX_DESCRIPTION)\n" | fmt
 endif
 	@echo "Targets:"
 	@grep -vE '^[[:space:]]' $(MAKEFILE_LIST) | grep -E '^.*:.* #' | sed -E 's/(.*):(.*):.*#(.*)/  \2###\3/' | column -t -s '###'
-ifdef MK_LICENSE
-	@echo "\n$(MK_LICENSE)" | fmt
+ifdef MEX_LICENSE
+	@echo "\n$(MEX_LICENSE)" | fmt
 endif
 
-# Checks `MK_ASSURE` variable if all the programs declared actually
+# Checks `MEX_ASSURE` variable if all the programs declared actually
 # exist on a machine. If not this exists make with error.
 .PHONY: .assure
 .assure:
-ifndef MK_ASSURE
-	@echo "Variable MK_ASSURE is not defined. Can not check for programs."
+ifndef MEX_ASSURE
+	@echo "Variable MEX_ASSURE is not defined. Can not check for programs."
 else
-	@for prog in $(shell echo $(MK_ASSURE)); do \
+	@for prog in $(shell echo $(MEX_ASSURE)); do \
 		if ! which $$prog > /dev/null; then \
 			echo "Error: '$$prog' not found on this machine."; \
 			exit 1; \