diff --git a/README.md b/README.md
index 79943d1..bcc0a32 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@
 
 ### Yotta
 
-[yotta](http://yottabuild.org) is a package manager and build system developped by mbed; it is the build system of mbed OS. To install it on your platform, please follow the yotta [installation instructions](http://docs.yottabuild.org/#installing).
+[yotta](http://yottabuild.org) is a package manager and build system developed by mbed; it is the build system of mbed OS. To install it on your platform, please follow the yotta [installation instructions](http://docs.yottabuild.org/#installing).
 
 Once yotta is installed, you can use it to download the latest version of mbed TLS form the yotta registry with:
 
@@ -64,7 +64,7 @@
 
     make check
 
-The tests need Perl to be built and run. If you don't have Perl installed, you can skip buiding the tests with:
+The tests need Perl to be built and run. If you don't have Perl installed, you can skip building the tests with:
 
     make no_test
 
@@ -122,7 +122,7 @@
 
     cmake -LH
 
-Note that, with CMake, if you want to change the compiler or its options after you already ran CMake, you need to clear its cache first, eg (using GNU find):
+Note that, with CMake, if you want to change the compiler or its options after you already ran CMake, you need to clear its cache first, e.g. (using GNU find):
 
     find . -iname '*cmake*' -not -name CMakeLists.txt -exec rm -rf {} +
     CC=gcc CFLAGS='-fstack-protector-strong -Wa,--noexecstack' cmake .