diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3ffd8e2..cb2fc6e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -141,6 +141,7 @@ set(SOURCES
   src/libc/string/strcmp.c
   src/libc/string/strcpy.c
   src/libc/string/strdup.c
+  src/libc/string/strerror.c
   src/libc/string/strlen.c
   src/libc/string/strncat.c
   src/libc/string/strncmp.c
diff --git a/STATUS b/STATUS
index 7fb0a2c..92d272c 100644
--- a/STATUS
+++ b/STATUS
@@ -129,7 +129,7 @@ DONE:       Function/symbol/macro is defined, builds, links, and is tested
 !    7.21.5.7  strstr: TODO
 !    7.21.5.8  strtok: TODO
      7.21.6.1  memset: DONE
-!    7.21.6.2  strerror: TODO
+     7.21.6.2  strerror: DONE
      7.21.6.3  strlen: DONE
      Extensions:
 !    - strnlen: TODO
diff --git a/src/libc/string/strerror.c b/src/libc/string/strerror.c
new file mode 100644
index 0000000..0a91180
--- /dev/null
+++ b/src/libc/string/strerror.c
@@ -0,0 +1,15 @@
+#include <string.h>
+#include <errno.h>
+
+static char *errno_strings [] = {
+	[0]        = "Success",
+	[EDOM]     = "Numerical argument out of domain",
+	[EILSEQ]   = "Invalid or incomplete multibyte or wide character",
+	[ERANGE]   = "Numerical result out of range",
+};
+
+char *strerror(int e)
+{
+	int count = sizeof errno_strings / sizeof errno_strings[0];
+	return (e >= 0 && e < count) ? errno_strings[e] : "<Unknown errno>";
+}