diff --git a/README.md b/README.md
index 0833a70..33c5d92 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ Implemented and tested:
 CORE:
 ! ' ( * */ */MOD + +! +LOOP , - . ." # #> #S <# >BODY >NUMBER / /mod 0< 0= 1+ 1- 2! 2* 2/ 2@ 2DROP 2DUP 2OVER 2SWAP
 : ; < = > >IN >R ?DUP @ ABORT ABS ALIGN ALIGNED ALLOT AND BASE BEGIN BL C! C, C@ CELL CELL+ CELLS CHAR CHAR+
-CHARS CONSTANT COUNT CR CREATE DECIMAL DEPTH DO DOES> DROP DUP ELSE EMIT ENVIRONMENT? EXECUTE EXIT FILL FM/MOD FIND
+CHARS CONSTANT COUNT CR CREATE DECIMAL DEPTH DO DOES> DROP DUP ELSE EMIT ENVIRONMENT? EVALUATE EXECUTE EXIT FILL FM/MOD FIND
 HERE HOLD I IF IMMEDIATE INVERT J LEAVE LITERAL LOOP LSHIFT M* MAX MIN MOD MOVE NEGATE OR OVER POSTPONE QUIT R> R@ RECURSE
 REPEAT ROT RSHIFT S>D S" SIGN SM/REM SOURCE SPACE SPACES STATE SWAP THEN TYPE U. U< UNTIL UM* UM/MOD UNLOOP VARIABLE WHILE WORD XOR [ ['] [CHAR] ] 
 
@@ -59,14 +59,14 @@ CORE-EXT:
 \
 
 Other sets:
-FORGET SEE BYE
+FORGET SEE BYE INCLUDE INCLUDED
 ```
 
 Missing:
 
 ```
 CORE:
-ABORT" ACCEPT EVALUATE KEY
+ABORT" ACCEPT KEY
 
 CORE-EXT:
 ACTION-OF DEFER DEFER! DEFER@ IS PARSE PARSE-NAME REFILL RESTORE-INPUT SAVE-INPUT SOURCE-ID [COMPILE]
diff --git a/include/fh_input.h b/include/fh_input.h
index 96b54d5..8396783 100644
--- a/include/fh_input.h
+++ b/include/fh_input.h
@@ -20,6 +20,7 @@ struct fh_input_spec_s {
   fh_input_refill_t refill_input_buffer;
   fh_input_free_t free_self;
   uint32_t linenum;
+  char *cwd; // CWD of the input, used for relative includes. malloc'd (strdup)
 
   // saved values, filled when pushing
   char saved_buffer[INPUT_BUFFER_SIZE];
@@ -32,17 +33,17 @@ struct fh_input_spec_s {
 /**
  * Push current input spec and state, replace with new one
  */
-void fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput);
+enum fh_error fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput);
 
 /**
  * Discard current input spec, restore previous.
  * fh->input will be NULL if this was the topmost one
  */
-void fh_pop_input(struct fh_thread_s *fh);
+enum fh_error fh_pop_input(struct fh_thread_s *fh);
 
 struct fh_input_spec_s *fh_create_input_from_filename(char *path);
-struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f);
-struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len);
+struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f, const char *path);
+struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len, const char *cwd); // cwd is strduped.
 void fh_input_teardown(struct fh_thread_s *fh);
 
 #endif //FORTH_FH_INPUT_H
diff --git a/include/forth_internal.h b/include/forth_internal.h
index f5dbc5d..7ba8111 100644
--- a/include/forth_internal.h
+++ b/include/forth_internal.h
@@ -17,6 +17,8 @@
 #include <stdlib.h>
 #include <stddef.h>
 #include <inttypes.h>
+#include <unistd.h>
+#include <linux/limits.h> // PATH_MAX
 
 #include "fh_config.h"
 #include "fh_error.h"
diff --git a/src/fh_builtins_meta.c b/src/fh_builtins_meta.c
index 2a288f1..43538fb 100644
--- a/src/fh_builtins_meta.c
+++ b/src/fh_builtins_meta.c
@@ -602,7 +602,50 @@ static enum fh_error w_evaluate(struct fh_thread_s *fh, const struct fh_word_s *
   uint32_t addr, count;
   TRY(ds_pop_addr_len(fh, &addr, &count));
 
-  fh_runtime_start(fh, fh_create_input_from_string(fh_str_at(fh, addr), count));
+  fh_runtime_start(fh, fh_create_input_from_string(fh_str_at(fh, addr), count, fh->input->cwd));
+  return FH_OK;
+}
+
+static enum fh_error w_included(struct fh_thread_s *fh, const struct fh_word_s *w)
+{
+  (void) w;
+  enum fh_error rv;
+  uint32_t addr, count;
+  TRY(ds_pop_addr_len(fh, &addr, &count));
+
+  if (count > 99) {
+    LOGE("Filename too long for INCLUDED");
+    return FH_ERR_NOT_APPLICABLE;
+  }
+
+  char tmp[100];
+  strncpy(tmp, fh_str_at(fh, addr), count);
+  tmp[count] = 0;
+
+  fh_runtime_start(fh, fh_create_input_from_filename(tmp));
+  return FH_OK;
+}
+
+static enum fh_error w_include(struct fh_thread_s *fh, const struct fh_word_s *w)
+{
+  (void) w;
+  enum fh_error rv;
+
+  char *wordname;
+  size_t namelen = 0;
+  fh_input_consume_spaces(fh);
+  TRY(fh_input_read_word(fh, &wordname, &namelen));
+
+  if (namelen > 99) {
+    LOGE("Filename too long for INCLUDED");
+    return FH_ERR_NOT_APPLICABLE;
+  }
+
+  char tmp[100];
+  strncpy(tmp, wordname, namelen);
+  tmp[namelen] = 0;
+
+  fh_runtime_start(fh, fh_create_input_from_filename(tmp));
   return FH_OK;
 }
 
@@ -702,5 +745,7 @@ const struct name_and_handler fh_builtins_meta[] = {
     {"marker",       w_marker,        0, 0},
     {"compile,",     w_compile_comma, 0, 0},
     {"evaluate",     w_evaluate,      0, 0},
+    {"included",     w_included,      0, 0},
+    {"include",     w_include,        0, 0},
     { /* end marker */ }
 };
diff --git a/src/fh_input.c b/src/fh_input.c
index c58dcd2..6480fee 100644
--- a/src/fh_input.c
+++ b/src/fh_input.c
@@ -1,38 +1,39 @@
 #include "forth_internal.h"
 
-void fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput)
+enum fh_error fh_push_input(struct fh_thread_s *fh, struct fh_input_spec_s *newinput)
 {
   LOG("--- Push input spec ---");
 
   if (newinput == NULL) {
     LOGE("push input with NULL");
-    return;
+    return FH_ERR_INTERNAL; // TODO IO
   }
 
   struct fh_input_spec_s *oldinput = fh->input;
-  if (NULL == oldinput) {
-    // no previous input spec, just use the new one
-    fh->input = newinput;
-    return;
-  }
-
   fh->input = NULL;
 
-  memcpy(&oldinput->saved_buffer[0], &fh->heap[INPUTBUF_ADDR], INPUT_BUFFER_SIZE);
-  oldinput->saved_inputlen = fh->inputlen;
-  oldinput->saved_inputptr = fh->inputptr;
-//  oldinput->saved_state = fh->state;
-  oldinput->saved_execptr = fh->execptr;
-  newinput->previous = oldinput;
+  if (NULL != oldinput) {
+    memcpy(&oldinput->saved_buffer[0], &fh->heap[INPUTBUF_ADDR], INPUT_BUFFER_SIZE);
+    oldinput->saved_inputlen = fh->inputlen;
+    oldinput->saved_inputptr = fh->inputptr;
+    oldinput->saved_execptr = fh->execptr;
+    newinput->previous = oldinput;
+  }
 
   fh->inputlen = 0;
   fh->inputptr = 0;
 
 //  fh_setstate(fh, FH_STATE_INTERPRET, 0);
   fh->input = newinput;
+
+  if (newinput->cwd) {
+    LOG("CD to %s", newinput->cwd);
+    chdir(newinput->cwd);
+  }
+  return FH_OK;
 }
 
-void fh_pop_input(struct fh_thread_s *fh)
+enum fh_error fh_pop_input(struct fh_thread_s *fh)
 {
   LOG("--- Pop input spec ---");
 
@@ -41,7 +42,7 @@ void fh_pop_input(struct fh_thread_s *fh)
 
   struct fh_input_spec_s *restored = discarded->previous;
   if (!restored) {
-    return;
+    return FH_OK; // topmost
   }
   fh->input = restored; // this can be NULL, that must be checked by caller.
 
@@ -54,6 +55,12 @@ void fh_pop_input(struct fh_thread_s *fh)
   if (discarded->free_self) {
     discarded->free_self(discarded);
   }
+
+  if (restored->cwd) {
+    LOG("CD to %s", restored->cwd);
+    chdir(restored->cwd);
+  }
+  return FH_OK;
 }
 
 struct file_input_spec {
@@ -63,7 +70,7 @@ struct file_input_spec {
 
 struct string_input_spec {
   struct fh_input_spec_s spec;
-  char *str;
+  const char *str;
   size_t len;
   size_t readpos;
 };
@@ -137,36 +144,56 @@ static bool str_refill(struct fh_thread_s *fh, struct fh_input_spec_s *spec)
 
 static void free_filespec(void *p)
 {
-  struct file_input_spec *spec = (struct file_input_spec *) p;
-  if (spec->file != stdin) {
-    fclose(spec->file);
-    spec->file = NULL;
+  struct file_input_spec *fis = (struct file_input_spec *) p;
+  if (fis->file != stdin) {
+    fclose(fis->file);
+    fis->file = NULL;
+  }
+  if (fis->spec.cwd) {
+    free(fis->spec.cwd);
+    fis->spec.cwd = NULL;
   }
-  free(spec);
+  free(fis);
 }
 
-struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f)
+static void free_strspec(void *p)
 {
-  struct file_input_spec *spec = calloc(sizeof(struct file_input_spec), 1);
-  if (!spec) {
+  struct string_input_spec *sis = (struct string_input_spec *) p;
+  if (sis->spec.cwd) {
+    free(sis->spec.cwd);
+    sis->spec.cwd = NULL;
+  }
+  free(sis);
+}
+
+struct fh_input_spec_s *fh_create_input_from_filestruct(FILE *f, const char *cwd)
+{
+  struct file_input_spec *fis = calloc(sizeof(struct file_input_spec), 1);
+  if (!fis) {
+    LOGE("Err alloc input spec struct");
     return NULL;
   }
 
-  spec->spec.free_self = free;
-  spec->spec.refill_input_buffer = file_refill;
-  spec->file = f;
-  return (struct fh_input_spec_s*) spec;
+  fis->spec.free_self = free_filespec;
+  fis->spec.refill_input_buffer = file_refill;
+  fis->file = f;
+  if (cwd) {
+    fis->spec.cwd = strdup(cwd);
+  }
+  return (struct fh_input_spec_s*) fis;
 }
 
 struct fh_input_spec_s *fh_create_input_from_filename(char *path)
 {
   struct file_input_spec *spec = calloc(sizeof(struct file_input_spec), 1);
   if (!spec) {
+    LOGE("Err alloc input spec struct");
     return NULL;
   }
 
   FILE *f = fopen(path, "r");
   if (!f) {
+    LOGE("Err open file \"%s\"", path);
     free(spec);
     return NULL;
   }
@@ -174,22 +201,33 @@ struct fh_input_spec_s *fh_create_input_from_filename(char *path)
   spec->spec.free_self = free_filespec;
   spec->spec.refill_input_buffer = file_refill;
   spec->file = f;
+
+  char pwd[PATH_MAX+1];
+  realpath(path, pwd);
+  char *end = strrchr(pwd, '/');
+  if (end) {
+    // add terminator
+    *end = 0;
+  }
+  spec->spec.cwd = strdup(pwd);
+  LOG("Input for file %s, path %s\n", path, pwd);
   return (struct fh_input_spec_s*) spec;
 }
 
-struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len)
+struct fh_input_spec_s *fh_create_input_from_string(char *str, size_t len, const char *cwd)
 {
-  struct string_input_spec *spec = calloc(sizeof(struct string_input_spec), 1);
-  if (!spec) {
+  struct string_input_spec *sis = calloc(sizeof(struct string_input_spec), 1);
+  if (!sis) {
     return NULL;
   }
 
-  spec->spec.free_self = free;
-  spec->spec.refill_input_buffer = str_refill;
-  spec->str = str;
-  spec->readpos = 0;
-  spec->len = len;
-  return (struct fh_input_spec_s*) spec;
+  sis->spec.free_self = free_strspec;
+  sis->spec.refill_input_buffer = str_refill;
+  sis->str = str;
+  sis->readpos = 0;
+  sis->len = len;
+  sis->spec.cwd = cwd ? strdup(cwd) : NULL;
+  return (struct fh_input_spec_s*) sis;
 }
 
 void fh_input_teardown(struct fh_thread_s *fh)
diff --git a/src/fh_parse.c b/src/fh_parse.c
index b10f04b..c6c9fce 100644
--- a/src/fh_parse.c
+++ b/src/fh_parse.c
@@ -227,7 +227,7 @@ enum fh_error fh_runtime_start(struct fh_thread_s *fh, struct fh_input_spec_s *i
 {
   enum fh_error rv;
   void *original_input = fh->input;
-  fh_push_input(fh, input);
+  TRY(fh_push_input(fh, input));
 
   if (fh_globals.interactive) {
     FHPRINT("%s", FH_PROMPT_STR);
@@ -258,7 +258,7 @@ enum fh_error fh_runtime_start(struct fh_thread_s *fh, struct fh_input_spec_s *i
           if (fh_globals.rescue) {
             fh_globals.interactive = 1;
             fh_input_teardown(fh);
-            fh_push_input(fh, fh_create_input_from_filestruct(stdin));
+            fh_push_input(fh, fh_create_input_from_filestruct(stdin, NULL));
           } else {
             return 1;
           }
@@ -276,7 +276,7 @@ enum fh_error fh_runtime_start(struct fh_thread_s *fh, struct fh_input_spec_s *i
 
     } else {
       LOG("Pop input");
-      fh_pop_input(fh);
+      TRY(fh_pop_input(fh));
       if (fh->input == original_input || !fh->input) {
         // we are done
         break;
diff --git a/src/main.c b/src/main.c
index e4eb022..9aa4fb1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,6 +3,9 @@
 #include <string.h>
 #include <unistd.h>
 #include <ctype.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <linux/limits.h>
 
 #include "forth.h"
 
@@ -13,6 +16,8 @@ int main(int argc, char *argv[])
   fh_globals.echo = 0;
 
   FILE *infile = stdin;
+  char pwd[PATH_MAX+1];
+  getcwd(pwd, PATH_MAX);
 
   // TODO use getopt
   for (int a = 1; a < argc; a++) {
@@ -52,6 +57,13 @@ int main(int argc, char *argv[])
         LOGE("Error opening infile: %s", argv[a]);
         return 1;
       }
+
+      realpath(argv[a], pwd);
+      char *end = strrchr(pwd, '/');
+      if (end) {
+        // add terminator
+        *end = 0;
+      }
     }
   }
 
@@ -63,7 +75,7 @@ int main(int argc, char *argv[])
     return 1;
   }
 
-  fh_runtime_start(&fh, fh_create_input_from_filestruct(infile));
+  fh_runtime_start(&fh, fh_create_input_from_filestruct(infile, pwd));
 
   // Show resource usage
   LOG("\nResources used: DS %dW, RS %dW, memory %dB\n",
diff --git a/testfiles/_included.f b/testfiles/_included.f
new file mode 100644
index 0000000..06c6128
--- /dev/null
+++ b/testfiles/_included.f
@@ -0,0 +1,2 @@
+." Included file" CR
+
diff --git a/testfiles/_included2.f b/testfiles/_included2.f
new file mode 100644
index 0000000..8d4eb99
--- /dev/null
+++ b/testfiles/_included2.f
@@ -0,0 +1,2 @@
+." Included file 2" CR
+
diff --git a/testfiles/include.f b/testfiles/include.f
new file mode 100644
index 0000000..7ed8e0a
--- /dev/null
+++ b/testfiles/include.f
@@ -0,0 +1,6 @@
+." main file" CR
+S" _included.f" INCLUDED
+." main file again" CR
+INCLUDE _included2.f
+." main file ends"
+CR