diff --git a/src/doc/exec.h/exec.3.md b/src/doc/exec.h/exec.3.md
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+exec_ae.3.md
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diff --git a/src/doc/exec.h/exec.h.0.md b/src/doc/exec.h/exec.h.0.md
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+% limb manual
+% exec.h(0)
+
+# NAME
+
+exec.h - execute a file
+
+
+# SYNOPSIS
+
+    #include <limb/exec.h>
+
+
+# DESCRIPTION
+
+The header defines functions to needed to execute a file.
+
+<inc skalibs.md>
+
+## Functions
+
+The following functions are defined :
+
+: [exec_ae](3)
+:: To execute a file specifying file, argv and environ.
+
+: [exec_a](3)
+:: Similar to [exec_ae](3) specifying file and argv (using global `environ`).
+
+: [exec_e](3)
+:: Similar to [exec_ae](3) specifying argv and environ (using `argv[0]` as file).
+
+: [exec](3)
+:: Similar to [exec_ae](3) specifying argv (using `argtv[0]` as file, and global
+:: `environ`).
+
diff --git a/src/doc/exec.h/exec_a.3.md b/src/doc/exec.h/exec_a.3.md
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+exec_ae.3.md
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diff --git a/src/doc/exec.h/exec_ae.3.md b/src/doc/exec.h/exec_ae.3.md
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+% limb manual
+% exec_ae(3)
+
+# NAME
+
+exec_ae, exec_a, exec_e, exec - execute a file
+
+# SYNOPSIS
+
+    #include <limb/exec.h>
+
+```pre hl
+void exec_ae(const char *<em>file</em>, const char * const *<em>argv</em>, const char * const *<em>env</em>)
+void exec_a(const char *<em>file</em>, const char * const *<em>argv</em>)
+void exec_e(const char * const *<em>argv</em>, const char * const *<em>env</em>)
+void exec(const char * const *<em>argv</em>)
+```
+
+# DESCRIPTION
+
+These functions will replace the current process image with a new process image,
+constructed from a regular executable file.
+
+The `exec_ae`() function will execute into `file`. If it does not contain a
+slash (`/`) then the file will be searched into the directories specified in the
+environment variable `PATH` or, if there's none, in the constant
+`SKALIBS_DEFAULTPATH` (defined when compiling skalibs).
+
+The `argv` and `env` arguments shall point to the arrays of arguments and
+environment for the new process, respectively. Execution is performed using a
+call to [execve](3).
+
+The `exec_a`() macro is similar to `exec_ae`() but using the global variable
+`environ` as environment.
+
+The `exec_e`() macro is similar to `exec_ae`() using `argv[0]` as file to
+execute.
+
+The `exec`() macro is similar to `exec_a`() using `argv[0]` as file to execute.
+
+# RETURN VALUE
+
+These functions should not return on success. Otherwise they set `errno` to
+indicate the error.
+
+# ERRORS
+
+These functions might fail and set `errno` for any of the errors described for
+[execve](3).
diff --git a/src/doc/exec.h/exec_e.3.md b/src/doc/exec.h/exec_e.3.md
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index 0000000..49be2e2
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+++ b/src/doc/exec.h/exec_e.3.md
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+exec_ae.3.md
\ No newline at end of file
diff --git a/src/liblimb/include/limb/exec.h b/src/liblimb/include/limb/exec.h
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+++ b/src/liblimb/include/limb/exec.h
@@ -0,0 +1,10 @@
+/* This file is part of limb                           https://lila.oss/limb
+ * Copyright (C) 2023 Olivier Brunel                          jjk@jjacky.com */
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef LIMB_EXEC_H
+#define LIMB_EXEC_H
+
+#include <skalibs/exec.h>
+
+#endif /* LIMB_EXEC_H */